- Today's Editor:
- Cleve Moler
- The MathWorks, Inc.
- moler@mathworks.com

- Flaw in Pentium Chip
- The Pentium Division Bug
- German Scientific Computing Home Page
- FTP Reports from SAM at ETH Zuerich
- MATLAB Code for Integer Programming
- Call for IVP Test Set Problems
- Software for Semidefinite Programming
- Modified Godunov Methods
- NA Summer School -- 1995: 2nd Announcement
- Seminar on Numerical Methods for PDE in Italy
- Conference on Numerical Mathematics Honoring Mike Powell
- Institue for Mathematics and its Applications Winter Tutorials
- Mathematics of Neural Networks
- SPIE Ill-posed Inverse Problems Symposium
- Conference on Flow through Porous Media
- Positions at City Polytechnic of Hong Kong
- Positions at Simon Fraser Centre
- Positions at the Australian National University
- Position at BEAM in Ithaca, NY
- New Book on Numerical Methods for Shallow-water Flow
- Contents, Transactions on Mathematical Software
- Springer Verlag Journals Preview Service
- Contents: Interval Computations;
- Contents, BIT

-------------------------------------------------------

From: Gene Golub <golub@sccm.Stanford.EDU>

Date: Thu, 24 Nov 94 11:44:09 PST

**Subject: Flaw in Pentium Chip**

In NY Times for Nov. 24, there is an article by John Markoff describing

an error in division operation of the Pentium chip made by INTEL. (The

article is on the business pages which seems to be where most computer

announcements are made!) There are quotes by Velvel Kahan and Cleve

Moler (there is also a photo of Cleve). I think it is good to call

such problems to the attention of our colleagues and students.

It would be good if we could help the manufacturers in debugging

their chips before they are released. Thank goodness we have

the efforts of Kahan but we need a more concerted effort.

Gene

------------------------------

From: Cleve Moler <moler@mathworks.com>

Date: Mon Nov 28 22:13:20 EST 1994

**Subject: The Pentium Division Bug**

Hi, all --

I've been unusually busy the last week. I would like to write

something specially for the NA Digest that explains why, but

I'm afraid I don't have enough time tonight. Maybe I can do

something by next week. In the meantime, you might go browsing

through the following.

-- Cleve

Pentium Papers Repository

The MathWorks is making a collection of "primary source" material on

the Pentium division bug available. If you're wired to the Web, try

www.mathworks.com -- "What's New" button

or, with anonymous FTP, try

ftp.mathworks.com -- directory /pub/tech-support/moler/Pentium

The documents available as of today, 11/28/94, are listed below.

This archive is intended as a reasonably complete historical record of

the events associated with the Pentium floating point division bug.

All of these documents are reproduced as they originally appeared on the

Net or elsewhere with full credit given to the authors and institutions

involved. Some material may be copyrighted and should be treated as such.

Nicely_original_post.txt

October 30. Memo from Prof. Thomas Nicely, Lynchburg College.

Calculations involving prime numbers lead to the first

description of the bug. Example is 1/824633702441.

Mathisen_first_post.txt

October 30. A series of Internet postings by Terje Mathisen,

Norsk Hydro, Norway, confirming the bug and lead to a test

program, p87test.zip.

EE_Times.txt

November 7. Article by Alex Wolfe in the EE Times, a weekly

trade publication with the headline,

INTEL FIXES A PENTIUM FPU GLITCH

Copyright (c) 1994 by the EE Times

Coe.txt

November 15. Internet posting by Tim Coe, Vitesse

Semiconductor, with a model of the chip's behavior and

the example 4195835/3145727.

Moler_first_post.txt

November 15. Internet posting by Cleve Moler, the MathWorks,

summarizing results to date. Examples include Nicely's prime

reciprocal and Coe's ratio.

Cable_News_Network.txt

November 22. Report by Steve Young on CNN's Moneyline includes

interviews with Intel's Stephen Smith and Moler.

MathWorks_press_release.txt

November 23. MathWorks issues a press release with the title

THE MATHWORKS DEVELOPS FIX FOR THE INTEL PENTIUM(tm) FLOATING

POINT ERROR

New_York_Times.txt

November 24. New York Times article by John Markoff with headline

CIRCUIT FLAW CAUSES PENTIUM CHIP TO MISCALCULATE, INTEL ADMITS

Copyright (c) 1994 by the New York Times

Associated_Press.txt

November 24. News story circulated by the Associated Press.

Copyright (c) 1994 by the Associated Press

Moler_second_post.txt

November 24. Internet posting by Moler describing a software/

hardware workaround for the FDIV bug.

Moler_third_post.txt

November 24. Internet posting by Moler announcing a Pentium-Aware

Release of MATLAB.

Intel_support.txt

November 24. America OnLine and Internet posting by

Ken Hendren, Intel Applications Support Manager.

Intel_FAX.txt

Intel FAXBACK Document #7999

Obtained from FAXBACK system at 800 628-2283

Nicely_second_post.txt

November 25. Memo from Prof. Nicely entitled "Pentium Bug

and the Intel NDA".

Andy_Grove.txt

November 27. Internet posting by Intel CEO Andy Grove entitled

"My Perspective on Pentium".

------------------------------

From: Ulrich Ruede <ruede@informatik.tu-muenchen.de>

Date: Mon, 21 Nov 1994 19:30:11 +0100

**Subject: German Scientific Computing Home Page**

German Scientific Computing Home Page

We have recently started to provide a collection of WWW

pages accessible via URL

http://www5.informatik.tu-muenchen.de/sci-comp/home.html

These documents collect information about Scientific Computing in Germany.

We invite the active participation of the Scientifc Computing Community

both within Germany and internationally. All feedback to

scicomp@informatik.tu-muenchen.de

is welcome.

Please help to make this service useful by sending us the information

you have!

Uli Ruede

Ulrich Ruede

Institut fuer Informatik, Technische Universitaet,

D-80290 Muenchen, Germany, e-mail: ruede@informatik.tu-muenchen.de

Tel: +49 89 21058238, Fax: +49 89 21052022

URL: http://www5.informatik.tu-muenchen.de/persons/ruede.html

------------------------------

From: bpohl@sam.math.ethz.ch

Date: Tue, 22 Nov 94 18:51:47 +0100

**Subject: FTP Reports from SAM at ETH Zuerich**

The Seminar fuer Angewandte Mathematik (SAM)

at

ETH Zuerich

now has an anonymous ftp-site from which you can ftp the

research reports, published at SAM.

To get there type

ftp ftp.sam.math.ethz.ch

Then login as anonymous, give your e-mail address as a password, then

cd pub/sam-reports

You can get the file README

and follow the instructions given in that file.

If you have difficulties, questions or suggestions please contact

Nicholas D. Ironmonger

SAM

ETH Zuerich

CH-8092 Zuerich

Tel: ++41 - 1 632 23 57

FAX: ++41 - 1 632 10 85

e-mail: ndi@sam.math.ethz.ch

------------------------------

From: Plamen Yalamov <bterer%BGCICT.BITNET@utkvm1.utk.edu>

Date: Thu, 24 Nov 1994 12:53:09 +0200

**Subject: MATLAB Code for Integer Programming**

Dear NA-NETers,

Is anyone aware of a MATLAB code for INTEGER PROGRAMMING ?

I have the Optimization Toolbox but there is nothing in

this toolbox. Could anyone send such a piece to me if it is free?

Plamen Yalamov

------------------------------

From: Walter Lioen <Walter.Lioen@cwi.nl>

Date: Mon, 28 Nov 1994 15:59:01 GMT

**Subject: Call for IVP Test Set Problems**

We, the Initial Value Problem group of Peter van der Houwen of the

numerical mathematics department of CWI, Amsterdam are working on

parallel ODE/DAE solvers in a project called `Parallel Codes for

Circuit Analysis and Control Engineering'.

At present we have parallel codes for ODEs and we are at the point of

adding the DAE part. However, for both categories of problems we have

a lack of good (i.e., large and difficult) test problems.

Presently Alfredo Bellen at Triest is composing a test set. This set

will be our point of departure, but we want to extend this test set.

If we succeed in this effort, both a descriptive report, and problem

sources, will be made available by anonymous ftp.

We are interested in:

- real life problems, for example but not limited to

electrical circuits, chemical reactions, control engineering;

- preferably published in the open literature;

- stiff (at least, on parts of the integration interval);

- high dimension (100-1000 or even larger);

- for the DAEs, the index should be restricted to 2;

- because of the desired dimension some machine readable format

preferably Fortran source but C, Pascal and Maple are also

welcome;

- all you can tell us about the solution;

- permission to make it publically available

(of course with the proper acknowledgements).

If you can not fulfil all of our wishes, but got the point, please

do not hesitate to react.

The project's group members are:

Peter J. van der Houwen <senna@cwi.nl> project leader,

Walter Hoffmann <walter@fwi.uva.nl> second project leader,

Ben P. Sommeijer <bsom@cwi.nl> senior researcher,

Jacques J.B. de Swart <jacques@cwi.nl> PhD. student,

Wolter van der Veen <jacques@cwi.nl> PhD. student,

Walter M. Lioen <walter@cwi.nl> scientific programmer.

Walter Hoffmann is of the University of Amsterdam.

All other members are working at CWI.

Please send a small description of what you could offer

(and how you score on our overcharged wish list)

to one of: bsom@cwi.nl, jacques@cwi.nl, wolter@cwi.nl.

Thanks in advance,

Walter M. Lioen

CWI, P.O. Box 94079, 1090 GB Amsterdam, The Netherlands.

e-mail: walter@cwi.nl phone: +31 20 5924101

fax: +31 20 5924199 telex: 12571 mactr nl

------------------------------

From: Lieven Vandenberghe <Lieven.Vandenberghe@esat.kuleuven.ac.be>

Date: Fri, 25 Nov 1994 09:26:15 +0100

**Subject: Software for Semidefinite Programming**

Semidefinite Programming

Software and Survey Paper available

In semidefinite programming we minimize a linear function subject

to the constraint that an affine combination of symmetric matrices

is positive semidefinite. Semidefinite programming unifies several

standard problems (e.g., linear and quadratic programming) and

finds many applications in control, structural optimization,

combinatorial optimization, and other fields. Although semidefinite

programs are much more general than linear programs, they can be

solved as efficiently. Most interior-point methods for linear

programming have been generalized to semidefinite programs.

As in linear programming, these methods have polynomial worst-case

complexity, and perform very well in practice.

A software package and a survey paper are now available via

anonymous ftp. The software consists of C-source that calls

LAPACK and also some matlab routines that work with a mex-file

interface.

To get the software, ftp as anonymous to isl.stanford.edu, and

cd to pub/boyd/semidef_prog. Set binary mode and get the file

semidef_prog.tar.Z (which includes semidef_prog.ps.Z, the

corresponding survey paper), and the appropriate mex-file. Quit ftp.

Uncompress and untar semidef_prog.tar.Z:

your-machine> zcat semidef.tar.Z | tar xvf -

You will then have a directory semidef which contains source code,

postscript documentation, source for matlab mex interfaces,

and example matlab files.

You can get the survey paper alone in pub/boyd/reports, in the

file semidef_prog.ps.Z. You may also be interested in several

related papers available via anonymous ftp in pub/boyd/reports,

e.g., pri_dual.ps.Z, mit-talk.ps.Z, ifac_eng_des.ps.Z.

Lieven Vandenberghe (K.U. Leuven)

Stephen Boyd (Stanford University)

------------------------------

From: M. Abouziarov <ABOUZIAROV@IIEVMS1.IIECUER.UNAM.MX>

Date: Fri, 25 Nov 1994 14:08 -0600

**Subject: Modified Godunov Methods**

Dear frends.

I have read your e-mail address in internet system and decided

to write you such letter:

I am mathematician from Russia, my name is Moustafa Abouziarov.

I have graduated from Moscow Physical-Technical Institute in 1981,

received doctor's degree in 1990, now I work in Mexico.

I am a specialist in numerical methods of continuum mechanics,

especially in Godunov's method , and the major result of my

scientific work is the modification of this well-known difference

The advantages of my modification of Godunov's

method are:

1. the second order accuracy in space and time is achieved

for the case of two and three 3-D variables, one must

account also for the variations due to the transversal

gradients;

2. no increase of the adjacent cell number is required for

analyzing the cell;

3. there is no difference between Euler case and Lagrang one.

4. the second order is achieved on the irregular and

moving meshes,where Godunov's method does not provide

even the first-order accuracy;

5. introduction of the first-order scheme predictor step

after the analysis of the spline for pressure makes it

possible to avoid non-physical oscillations;

6. the second-order approximation on the "rigid wall"- type

boundary is achieved;

7. no substantional modifications of the present software

systems ,based on Godunov's method, are required;

8. the controlled viscosity makes it possible to handle the

Navier-Stokes equations,using the scheme for the Euler

equations;

9. the approach is easily extended to the versions of Godu-

nov's method for simulating the elastic-plastic flows and

handling the Timoshenko-type shell equations.

10. the present modifications is essentially effective to analyze

3-D problems of high-energy shocks in fluids and gases and

the hypersonic flows.

I used this modification of Godunov's method to analyze 2-D

problems of high-energy shocks,generated by detonation of solid

explosive, in fluids and gases in elastic-plastic tanks. I

received reliable results.

Then I have extended my modification for nonlinear case. In

this case it is necessary to take into account some nonlinear

properties of Riemann's problem solution and the quadratic

spline for density.

My results are similar or better than [1].

But I have some problem, I think you know it.

If I solve the test from [1] about interaction of two blast wave as

a two-dimensional problem ( X is direction of propagation of waves)

with the rigged walls on Y=Y0 and on Y=Y1 (conservative boundary

conditions on Y direction) on Y direction I receive some

oscillations of pressure and density and I receive Y direction

velocity. The altitude of this oscillations may be about 10%

or more for pressure. Somebody calls it as nonlinear nonstability.

I do not know how to avoid this nonphysical oscillations. They are

generated by rigged body boundary conditions.

So I would like to have contact with specialists in this area

to solve this and some other problems, conserning modifications of

Godunov's method for some other kinds of equations, lenearized

Navier-Stokes equations for example, different state equations

and etc. If you know e-mails addresses of such specialists

( [1] and etc.) in USA and etc., please, send me them.

[1] Colella P. and Woodword P. The Piecewise Parabolic method

for Gas-Dynamical Simulations. // J. Comp. Phys. 1984.

V. 54. P. 174 - 202.

My e-mail address: < abouziarov@iievms1.iiecuer.unam.mx >

Best regards

M.Abouziarov.

------------------------------

From: Gene Golub <golub@sccm.Stanford.EDU>

Date: Sun, 20 Nov 94 17:49:07 PST

**Subject: NA Summer School -- 1995: 2nd Announcement**

AMS-SIAM Summer Seminar in Applied Mathematics

"Mathematics of Numerical Analysis: Real Number Algorithms"

Park City, Utah, July 17--August 11, 1995

The twenty-fifth AMS--SIAM Summer Seminar in Applied Mathematics will

be held July 17--August 11, 1995 at the Prospector Square Inn and

Conference Center, Park City, Utah. The seminar will be sponsored by

the American Mathematical Society, the Society for Industrial and

Applied Mathematics, and the International Mathematical Union. It is

anticipated that the seminar will be partially supported by grants

from federal agencies. The proceedings will be published by the AMS

in the "Lectures in Applied Mathematics" series.

The mathematical theory of real number algorithms is to be the subject

of this proposed conference. Thus numerical analysis will be central

with emphasis on geometrical, algebraic, analytic, and foundational

perspectives. Investigations of efficiency will play a special role.

Practical algorithms will be the subject of theoretical analysis, but

immediate useful results will not be demanded.

It is hoped that the conference will give the subject of numerical

analysis a greater coherence through a focus on the mathematical side.

In particular, to aim to strengthen the unity of mathematics and

numerical analysis, and to narrow the gap between pure and applied

mathematics. That goal is appropriate since many of the heroes of

pure and applied mathematics, Newton, Euler, Lagrange, and Gauss among

them, established the basic real number algorithms. With the

revolution of the computer and the great achievements of scientific

computation, it does service to both the pure and applied communities

to support the mathematical development of numerical analysis.

This is an appropriate time to schedule such a meeting in view of the

rapid development of heuristic work, a good base of theoretical work,

and a widespread desire for mathematical deepening of the subject.

The conference will be international in character with strong

representation from the most mathematically developed parts of

numerical analysis. Besides tutorials and short courses, seminars in

the following areas are contemplated: linear algebra, nonlinear

systems-path following, differential equations, linear programming

problems, algebraic questions, foundations, information based

complexity, lower bounds, and approximation theory.

The organizing committee includes

Eugene L. Allgower, Colorado State University;

Lenore Blum, MSRI;

Alexandre J. Chorin, University of California, Berkeley;

Philippe G. Ciarlet, Universit\'e Pierre et Marie Curie, Paris;

Felipe Cucker, Universitat Pampeu Fabra, Spain;

James W. Demmel, University of California, Berkeley;

Ronald A. DeVore, University of South Carolina, Columbia;

Gene H. Golub, Stanford University;

Arieh Iserles, University of Cambridge, UK;

Hubertus Th. Jongen, Reinisch-Westf Tech Hochschule, Aachen,

Germany;

Herb Keller, California Institute of Technology;

Jacques Louis Lions, College de France;

James M. Renegar, Cornell University;

Steve Smale (Chair), University of California, Berkeley;

Michael Shub, IBM;

Gilbert Strang, MIT;

Shmuel Winograd, IBM; and

Henryk Wozniakowski, University of Warsaw and Columbia

University.

To date the following have accepted invitations to speak:

All members of the organizing committee;

Roger Brockett, Harvard University;

John Canny, University of California, Berkeley;

W. Dahmen, Reinisch-Westf Tech Hochschule, Aachen, Germany;

David Donoho, University of California, Berkeley;

James G. Glimm, SUNY at Stony Brook;

N. Karmarker, A T & T Bell Laboratories;

T. Y. Li, Michigan State University;

Arkadi Nemirovski, Israel Institute of Technology;

Victor Pan, Herbert H. Lehman College, CUNY;

Vladimir Rokhlin, Yale University;

Marie-Francoise Roy, Universit\'e de Rennes;

Roger Temam, Indiana University;

Richard S. Varga, Kent State University;

Victor A. V. Vassiliev, Institute for System Studies, Moscow;

Margaret H. Wright, A T & T Bell Laboratories;

Yosef Yomdin, Weizmann Institute of Science, Israel;

Mike Powell, Cambridge; and

D. Grigoriev, Penn State (Tentative).

Park City is a popular summer vacation destination with a comfortable,

temperate climate in the mountains of Utah. Housing for participants

has been arranged at the Prospector Square Inn and Conference Center.

Inexpensive restaurants, food shops, and other attractions are within

walking distance of the Inn. The Prospector Square Inn includes eight

buildings with rustic ski lodge style accommodations, in addition to a

large lecture hall and meeting rooms. A sports center including pool,

exercise machines, racquetball courts, etc. (all available for an

extra charge) is located on the property. All rooms being held for

participants contain two double- or queen-sized beds, television,

telephone, microwave oven, and refrigerator. Some units have full

kitchens. The daily cost is $45 single or double occupancy ($50

triple and $55 quad) plus 10.25% lodging tax. Note that these prices

are per room, not per person. For those attending the full four weeks

of the seminar, a very limited number of one-, two-, and three-bedroom

condominium units is available on a monthly basis. Those interested

should contact the conference coordinator. More detailed information,

including how to make reservations, will be included with the official

invitation to the seminar.

There is a registration fee of $40. Everyone interested receiving an

invitation to attend should send the following information before

February 15, 1995, to AMS--Summer Seminar Conference Coordinator, AMS

Meetings and Conferences Department, P.O. Box 6887, Providence,

RI 02940; e-mail dls@math.ams.org. Please type or print the following:

1. Full name and mailing address;

2. Telephone number and area code for office and home;

3. E-mail address if available;

4. Anticipated arrival and departure dates;

5. Your scientific background relevant to the topic of the seminar;

please indicate if you are a student or if you received your Ph.D. on or

after 7/1/89;

6. Financial assistance requested (please estimate cost of travel);

indicate if support is not required and if interested in attending

even if support is not offered.

7. Indicate if you would like to be included on a list of those

desiring a roommate for the seminar. If yes, please indicate if you

are male or female, and list any other pertinent information (i.e.,

smoking/nonsmoking).

Special encouragement is extended to junior scientists to apply. A

special pool of funds expected from federal agencies has been

earmarked for this group. Other participants who wish to apply

for a grant-in-aid should so indicate; however, funds available for

the seminar are very limited, and individuals who can obtain support from

other sources should do so. Advanced graduate students

are encouraged to participate.

------------------------------

From: Claudio Canuto <CCANUTO@polito.it>

Date: Mon, 21 Nov 1994 15:20:42 GMT+1

**Subject: Seminar on Numerical Methods for PDE in Italy**

POLITECNICO DI TORINO ISTITUTO DI ANALISI NUMERICA DEL C.N.R.

Dipartimento di Matematica Pavia

Seminar on

RECENT ADVANCES IN NUMERICAL METHODS FOR PARTIAL DIFFERENTIAL EQUATIONS

Politecnico di Torino - February 14-16, 1995

TOPICS: adaptivity and a-posteriori error estimates, multi-level techniques

(hierarchical bases, wavelets, non-linear Galerkin methods), discretization

methods for multi-scale phenomena.

INVITED LECTURERS:

R.E.BANK (San Diego) W.DAHMEN (Aachen)

S.JAFFARD (E.N.P.C.) C.JOHNSON (Goteborg)

Y.MADAY (Paris VI) A.T.PATERA (M.I.T.)

R.TEMAM (Orsay) R.VERFUERTH (Bochum)

J.XU (PennState) H.YSERENTANT (Tubingen)

CALL FOR CONTRIBUTIONS: in addition to the invited seminars, a limited

number of short contributions on the themes of the Seminar will be presented.

People interested should submit a title and a one-page abstract to one of

the Organizers BEFORE JANUARY 15, 1995 at the addresses below.

REGISTRATION FEE: a registration fee of 180,000 Italian Lire (reduced to

150,000 It.Lire for members of SIMAI or affiliated organizations, and

to 100,000 It.Lire for students) will be required to cover lunches,

coffee-breaks and social activities.

ACCOMMODATION: Hotel accommodation in Torino will be available at special

discount rates (from 80,000 It.Lire in a **-hotel to 150,000 It.Lire in

a ****-hotel, per single room per day, continental breakfast included).

INFORMATION AND REGISTRATION: People interested in the Seminar should contact

one of the Organizers at the addresses below BEFORE JANUARY 15, 1995,

preferably using fax or e-mail.

ORGANIZATION: The Seminar is organized with the collaboration of SIMAI, ASI,

Cassa di Risparmio di Torino, and other funding institutions.

CLAUDIO CANUTO ALESSANDRO RUSSO

Dipartimento di Matematica Istituto di Analisi Numerica

Politecnico di Torino Consiglio Nazionale delle Ricerche

corso Duca degli Abruzzi, 24 via Abbiategrasso, 209

I-10129 Torino ITALY I-27100 Pavia ITALY

tel. +39 11 564 7543 tel. +39 382 529 600

fax +39 11 564 7599 fax +39 382 529 566

e-mail: ccanuto@polito.it e-mail: russo@dragon.ian.pv.cnr.it

------------------------------

From: Arieh Iserles <A.Iserles@amtp.cam.ac.uk>

Date: Mon, 21 Nov 94 22:05:42 GMT

**Subject: Conference on Numerical Mathematics Honoring Mike Powell**

Conference on Numerical Mathematics

Celebrating the 60th Birthday of M.J.D. Powell

University of Cambridge, England

27--30 July 1996

The opportunity for this conference is provided by the sixtieth

birthday of one of the world's leading numerical mathematicians, whose

contributions to optimization and approximation have been decisive. The real

purpose, however, is to celebrate numerical mathematics and scientific

computing.

The University of Cambridge, where Mike Powell has been for the last

eighteen years the John Humphrey Plummer Professor of Applied Numerical

Analysis, is a suitable setting for this event. The participants will

be accommodated at historic Magdalene College, in the city centre

of Cambridge.

There will be ten invited, longer lectures that focus on optimization

and approximation theory, but submitted papers, addressing themselves

to original and timely research, are welcome in all fields of

numerical mathematics. We would now like to call for papers to be

presented at this conference. All such papers will be considered for

inclusion into a proceedings. They can be submitted to

either Martin Buhmann or Arieh Iserles, by e-mail or otherwise. Every

submission should contain the title of the talk and an abstract. The

duration of submitted talks will be 25 minutes.

The invited speakers are

Ian Barrodale (Victoria, B.C.)

Carl de Boor (University of Wisconsin at Madison)

Roger Fletcher (University of Dundee)

Gene Golub (Stanford University)

Charles Micchelli (IBM Yorktown Heights)

Jorge More (Argonne National Laboratory)

Beresford Parlett (University of California at Berkeley)

Mike Powell (University of Cambridge)

Mike Todd (Cornell University)

Philippe Toint (University of Namur)

The organizing committee consists of Ian Barrodale (Victoria, B.C.),

Martin Buhmann (ETH Zurich), Wolfgang Dahmen (RWTH Aachen),

Roger Fletcher (University of Dundee), Arieh Iserles (University

of Cambridge), Will Light (University of Leicester), Bill Morton

(University of Oxford), Mike Todd (Cornell University) and Philippe

Toint (University of Namur).

Support for the conference is provided by the London Mathematical Society.

For more information contact:

* M.D. Buhmann

Mathematik Departement

ETH Zentrum

8092 Zurich

Switzerland

E-Mail: mdb@math.ethz.ch

or

* A. Iserles

Department of Applied Mathematics and Theoretical Physics

Silver Street

Cambridge CB3 9EW

England

E-Mail: ai@amtp.cam.ac.uk

------------------------------

From: Robert Gulliver <gulliver@s2.ima.umn.edu>

Date: Wed, 23 Nov 94 12:50:40 CST

Received: by s2.ima.umn.edu; Wed, 23 Nov 94 12:50:40 CST

**Subject: Institue for Mathematics and its Applications Winter Tutorials**

During Winter, 1995 the Institute for Mathematics and its Applications in

Minneapolis will hold two tutorials on Inverse Problems in Wave Propagation.

The January 17-20 tutorial will emphasise electromagnetic waves, with

applications to tomography and random media; survey talks by David Colton,

Adel Faridani, and George Papanicolaou are planned. The January 30-February 3

tutorial will be more closely relevant to acoustic waves, e.g. as applied in

acoustic microscopy (geophysics) and seismology; the IMA expects to hear

talks from Jan Achenbach, Christof Stork, William Symes and Gunther Uhlmann.

For more information contact ima-staff@ima.umn.edu.

------------------------------

From: J. C. Mason <SCOMJCM@pegasus.hud.ac.uk>

Organization: The University of Huddersfield HEC

**Subject: Mathematics of Neural Networks**

CALL FOR PAPERS -

MATHEMATICS of NEURAL NETWORKS and APPLICATIONS (MANNA 1995)

International Conference at Lady Margaret Hall, Oxford,

July 3-7, 1995

- run by the Universities of Huddersfield and Brighton

- with support from the London Mathematical Society

We are delighted to announce the first conference on the Mathematics

of Neural Networks and Applications (MANNA), in which we aim to

provide both top class research and a friendly motivating atmosphere.

Applications of neural networks (NNs) have often been carried out with

a limited understanding of the underlying mathematics but it is now

essential that fuller account should be taken of the many topics that

contribute to NNs: approximation theory, control theory, genetic

algorithms, dynamical systems, numerical analysis, optimisation,

statistical decision theory, statistical mechanics, computability and

information theory, etc. .

We aim to consider the links between these topics and the insights

they offer, and identify mathematical tools and techniques for

analysing and developing NN theories, algorithms and applications.

Working sessions and panel discussions are planned.

Keynote speakers who have provisionally accepted invitations include:

N M Allinson (York University, UK) S Grossberg (Boston, USA)

S-i Amari (Tokyo) M Hirsch (Berkeley, USA)

N Biggs (LSE, London) T Poggio (MIT, USA)

G Cybenko (Dartmouth USA) H Ritter (Bielefeld,Germany)

J G Taylor (King's College, London) P C Parks (Oxford)

It is anticipated that up to 40 contributed papers will be presented.

The proceedings will be published, probably as a volume of an

international journal, and contributed papers will be considered for

inclusion. The deadline for submission of abstracts is 17 February

1995.

Accommodation will be available at Lady Margaret Hall (LMH) where many

rooms have en-suite facilities. The conference will start with

Monday lunch and end with Friday lunch, and there will be a full-board

charge (including conference dinner) of about 235 pounds for this

period as well as a conference fee of 195 pounds. We expect to be

able to offer a reduction in fee to those who give submitted papers,

and a very low fee to a number of recommended bona-fide students who

book early.

There will be a supporting social programme, including reception,

outing(s) and conference dinner, and family accommodation may be

arranged in local guest houses.

Committee:

S W Ellacott (Brighton) and J C Mason (Huddersfield) (Organisers) ;

I Aleksander, N M Allinson, N Biggs, C M Bishop, D Lowe, P C Parks,

J G Taylor, K Warwick

For information, contact:

Mrs R.Hawkins, School of Computing and Mathematics,

University of Huddersfield, Queensgate , Huddersfield HD1 3DH

Email: R.Hawkins@hud.ac.uk Phone: 44+(0)484 472150

------------------------------

From: Chris Johnson <crj@sci2.cs.utah.edu>

Date: Thu, 24 Nov 1994 14:06:15 -0700

**Subject: SPIE Ill-posed Inverse Problems Symposium**

Call for Papers

Experimental and Numerical Methods for Solving Ill-Posed Inverse

Problems: Medical and Nonmedical Applications

Conference Chairs: Randall L. Barbour, SUNY/Brooklyn; Mark J.

Carvlin, Bristol-Myers Squibb Co.; Michael A. Fiddy, Univ. of

Massachusetts/Lowell

Program Committee: David Isaacson, Rensselaer Polytechnic

Institute; Norman J. McCormick, Univ. of Washington; Michael V.

Klibanov, Univ. of North Carolina/Charlotte; Christopher R.

Johnson, Univ. of Utah; Robert V. McGahan, Rome Lab.

Part of SPIE's 1995 International Symposium

July 9-14, 1995

San Diego Convention Center

San Diego, CA

Imaging methods are increasingly being applied to a wide range of

applications that include clinical medicine, geophysics, remote sensing,

and materials testing. Sources can be magnetic, acoustic, electrical, or

electromagnetic in origin. These may be located external to the medium or

inside. Detection modes may or may not be time dependent and can range from

backscatter only to full tomographic measurement schemes. A common feature

complicating many of these methods is the uncertainty regarding the volume

of medium probed by the penetrating or emitted energy. Frequently, this

uncertainty is due to the effects of scattering. Accurate knowledge of the

energy distribution requires information about the medium, which is the

unknown being examined. As a result, useful methods frequently must

consider approximate solutions that represent compromises between

computational effort, physical accuracy of the modeling scheme, and quality

and type of available data.

Principal topics of interest will fall into three main areas:

(1) mathematical aspects of inverse methods (e.g., dealing

with ill-conditioning, limited noisy data, missing phase

information, superresolution, etc.);

(2) modeling methods for forward and inverse scattering

phenomena (e.g., approximate solutions to integral equations of

scattering, finite difference time domain, and projection

tomographic techniques); and

(3) interdisciplinary applications, including clinical

medicine, optics, astronomy, remote sensing, etc.

This conference will bring together leading experts from

universities, medical centers, government laboratories, and

industry to discuss the latest developments in the diverse and

fast developing field.

Chris Johnson, Ph.D.

Department of Computer Science

University of Utah

Email: crj@cs.utah.edu

WWW: http://www.cs.utah.edu/~crj

------------------------------

From: Claude Carasso <carasso@anumsun1.univ-st-etienne.fr>

Date: Mon, 28 Nov 94 16:07:49 +0100

**Subject: Conference on Flow through Porous Media**

INTERNATIONAL CONFERENCE ON

MATHEMATICAL MODELLING OF

FLOW THROUGH POROUS MEDIA

MAY 22-26, 1995

SAINT-ETIENNE (FRANCE)

ORGANIZING COMMITTEE

A. BOURGEAT, C. CARASSO (France), R. EWING (USA), S. LUCKHAUS (Allemagne),

A. MIKELIC (France), M. PRIMICERIO (Italie)

FIRST LIST OF PARTICIPANTS

I. AGANOVIC (Croatie), G. ALLAIRE (France), S. ANTONTSEV (Espagne),

M. AVELLANEDA (U.S.A.), C.I. BARENBLATT (Russie), J. BEAR (Israel),

G. CHAVENT (France), J.H. CUSHMAN (U.S.A.), G. DAGAN (Israel),

J. DOUGLAS Jr (U.S.A.), H. ENE (Roumanie), A.FASANO (Italie),

T. GALLOUET (France), I.W. GELHAR (U.S.A.), R. GILBERT (U.S.A.),

J. GLIMM (U.S.A.), R.A. GREENKORN (U.S.A.), A. GUTJAHR (U.S.A.),

U. HORNUNG (Allemagne), S. KOZLOV (France), R. LENORMAND (France)

V.N. MONAKHOV (Russie), G.PANASENKO (France), P.PANFILOV (Russie),

G.PAPANICOLAOU (U.S.A.), M.QUINTARD (France), T.F RUSSEL (U.S.A.),

J.M.THOMAS (France), C.J.VAN DUIJN (Hollande), M.F. WHEELER (U.S.A.),

S.WHITAKER (U.S.A.), Y.C. YORTSOS (U.S.A.), V.ZHIKOV (Russie)

AIM OF THE CONFERENCE

The main goal of this conference is to bring together leading

researchers in the field of modelling flow in porous media and

to provide a forum for discussion on thecurrent state of

modelling.

The conference will address both the pure theoretical question in

modelling and the use of

various models in numerical simulations.

The conference areas of interest focus on :

- Pore scale models, macropores, fractured media, percolation

- Scaling up, averaging, macrodispersion and homogenization

- Filtration of non Newtonian fluids, multiphase flow and contaminant transport

- Free and moving boundary problems

- Geochemical models, reactive porous media

- Numerical simulation of flows and transport phenomena in porous media

SCIENTIFIC PROGRAM AND PUBLICATION

In addition to the invited lectures a number of posters sessions will

take place.

The conference proceedings will be published and will mainly

include the lectures and selected posters. Moreover there will be

a poster session devoted to industrial research activities

REGISTRATIONFEE

Before April 1st / after April 1st

Delegate from a company 2 500 FF 2 900 FF

University Members 1 200 FF 1 500 FF

INFORMATIONS

Congres Milieux Poreux, Analyse Numerique,

23 rue du Dr Paul Michelon

42023 Saint Etienne cedex 2. FRANCE

Tel. : (33) 77.42.15.35-Fax. : (33) 77.25.60.71

e-mail : cmp@anumsun1.univ-st-etienne.fr

For more details please connect by e-mail to :

cmpinfo@anumsun1.univ-st-etienne.fr

or with mosaic, gopher or xgopher at :

gopher://gopher.univ-st-etienne.fr.

------------------------------

From: Daniel Ho <MADANIEL@cphkvx.cphk.hk>

Date: Mon, 21 Nov 1994 10:56:10 +0800

**Subject: Positions at City Polytechnic of Hong Kong**

City Polytechnic of Hong Kong

(City University of Hong Kong - designate)

The City Polytechnic of Hong Kong is a well established degree-

granting institution in Hong Kong funded by the government

through the University and Polytechnic Grants Committee. Its

current student population is 15,158 and the number is expected

to grow to 16,000 by the mid-1990's. The Polytechnic is

committed to excellence in teaching and research and to a close

relationship with the community and industry. The medium of

instruction is English. Applications are invited for the

following posts:

University Lectures

Department of Mathematics [Ref.A/164/43]

The Department is seeking applicants for two positions to begin

in September 1995. One position is for a Numerical analyst

specialized in numerical solution of partial differential

equations and the other position can be in any field of Applied

Mathematics. Applicants should have a PhD in Mathematics or a

related discipline with strong research record or excellent

research potential as well as a commitment to teaching

undergraduate and postgraduate students.

Salary: HK$34,415 - $57,490 per month

(Exchange rate: US$1 = HK$7.8 approximately)

Appointment may be on superannuable terms with provision for

retirement benefit or on a fixed term contract with gratuity

payable at 15% of basic salary upon completion of contract.

Generous fringe benefits include medical and dental schemes, long

leave and housing assistance where applicable.

Further information can be obtained from the Personnel Office,

City Polytechnic of Hong Kong, Tat Chee Avenue, Kowloon,

Hong Kong

(Fax: 852-7881154/852-7889334, E-mail: PORECRUT@CITYU.EDU.HK)

or from Professor Roderick S.C. Wong, Head of Department of

Mathematics (E-mail: MAWONG@CITYU.EDU.HK). Please apply with

a curriculum vitae including a list of publications, a statement

describing current and planned research, and the names and

addresses of three academic referees to the Personnel Office by

the end of February 1995.

------------------------------

From: Loki Jorgenson <loki@pecos.cecm.sfu.ca>

Date: Sun, 20 Nov 1994 23:44:52 -0800 (PST)

**Subject: Positions at Simon Fraser Centre**

SIMON FRASER CENTRE FOR EXPERIMENTAL AND CONSTRUCTIVE MATHEMATICS

(For more information on the Centre's activities, see the CECM prospectus

available through the CECM Information Services at gopher.cecm.sfu.ca

or http://www.cecm.sfu.ca)

The Centre is soliciting applications for one or two POST-DOCTORAL

FELLOWS and/or RESEARCH ASSOCIATES commencing after July 1, 1995, in

any areas compatible with the interests of the centre (specifically

aspects of computationally assisted mathematical analysis, number

theory and discrete mathematics). Applicants with a PhD in Mathematics,

Computer Science or Operations Research will be favoured.

The PDFs are primarily research positions though some teaching may be

involved. Research associates may be involved in significant software

development. Applicants should send a curriculum vitae and arrange for

three letters of reference to be sent to Dr. J.M. Borwein, Director

CECM, Department of Mathematics and Statistics, Simon Fraser

University, Burnaby B.C., V5A 1S6. Applicants should list relevant work

and educational experience; interested candidates should look at the at

the Centre's prospectus for more information (see above).

For RESEARCH ASSOCIATES a strong background in computing is preferred

with a knowledge of FORTRAN, LISP, C or C++ (as well as OOP) considered

an asset although not essential. A familiarity with mathematical

problem-solving platforms (such as MATLAB, Maple, Mathematica, Macsyma,

MuPAD, Pari, etc.), either as a user or as a programmer, is also helpful.

This Centre located in Burnaby, British Columbia (Greater Vancouver) is

dedicated to further research and graduate education in Computation in

the Mathematical Sciences. The Centre provides a sophisticated mix of

computation, experimentation and mathematics. Of interest are questions

on how one uses the computer: To build intuition? To generate

hypotheses? To validate conjectures or prove theorems? To discover

nontrivial examples and counter-examples?

The steering committee consists of J. Borwein (Director), P. Borwein,

L. Goddyn, L. Jorgenson, R. Russell, and M. Trummer. Inquiries may be

directed to J. Borwein at the CECM or via Email to jborwein@cecm.sfu.ca.

------------------------------

From: Markus Hegland <marcus@thrain.anu.edu.au>

Date: Wed, 23 Nov 1994 12:45:03 +1100

**Subject: Positions at the Australian National University**

THE AUSTRALIAN NATIONAL UNIVERSITY

SCHOOL OF MATHEMATICAL SCIENCES

CENTRE FOR MATHEMATICS AND ITS APPLICATIONS

POSTDOCTORAL FELLOW/RESEARCH FELLOW

( LEVEL A/LEVEL B)

IN ADVANCED COMPUTATION

Applications are invited for appointment to a position at the level of

Postdoctoral Fellow or Research Fellow in the Advanced Computation and

Modelling Program of the Centre for Mathematics & its Applications. The

current research interests of the program includes mathematical software

research and development, numerical methods for partial differential

equations optimization including applications to statistical computing, and

inverse problems.

Appointments will be made for periods of up to three years and may be

extended. The initial level of appointment, depending on the candidate's

experience and qualifications, will lie within the following salary ranges:

Postdoctoral Fellow [Level A] $36,795-$39,495 p.a.

Research Fellow [Level B] $41,574-$49,370 p.a.

Assistance with relocation expenses may also be provided.

Part-time appointment may be available as well as an extended visiting

appointment during a period of leave of absence from a home institution.

Enquires and requests for further information including selection criteria

can be addressed to Professor M R Osborne (email

Mike.Osborne@maths.anu.edu.au Fax 06 2490759). Professor Osborne can be

contacted at Texas A&M University until December 16 1994 (email

mike@cs.tamu.edu).

Closing Date: 23 January 1994 Ref: SMS 15.11.1

Email addresses and/or fax numbers should be provided for referees so that

appointment procedures can be expedited.

APPLICATIONS addressing the selection criteria should be submitted in

duplicate to The Secretary, The Australian National University, Canberra,

ACT 0200 quoting reference number and including curriculum vitae, list of

publications and names and addresses of at least three referees. Further

information is available from either of the contacts listed above. The

University has a "no smoking" policy effective in all University buildings

and vehicles.

------------------------------

From: Gal Berkooz <gal@cam.cornell.edu>

Date: Tue, 22 Nov 1994 22:41:19 -0500

**Subject: Position at BEAM in Ithaca, NY**

BEAM

Engineering and Applied Research

205 W. Court St.

Ithaca, New York 14850

Employment Opportunity

Research & Development

Scientist / CFD-Flow

Optimization

Status: Full time exempt position. Supervision received: Reports to President/Project Leader.

Supervision exercised: Scientific programmers/None. Date posted: 11/16/1994. Start Date:

2/1/1995 or when qualified applicant is selected. Location: Ithaca, NY.

Job Summary: Develop and modify production CFD codes with turbulence models to perform flow

analysis and flow optimization. Work to integrate CFD-Flow Optimization software into other

software products. Participate in the development of flow analysis and other scientific software.

Participate in solving and analyzing specific configurations related to jet flows and complex

geometry nozzles. Write technical reports and present results to government and industry concerns.

Competency Required: Ability to develop high quality numerical codes. Ability to integrate

developed code with other existing software. Ability to independently initiate and pursue technical

objectives. Excellent communications and team-working skills.

Education/Experience Required: A Ph.D. in fluids mechanics or applied mathematics involving

the development and application of flow optimization codes or equivalent work experience. At least

two years of post-doctoral work or equivalent experience required. Applications from promising

recent graduates will be considered. Experience in industry a plus. Experience with numerical

analysis, and analyzing and choosing algorithms. Some experience with generating geometries for

complex configurations. Experience with development of GUIUs a plus.

Salary and Benefits: Salary of $45,000-$65,000 commensurate with qualifications and experience.

BEAM offers a comprehensive benefits package and stock ownership programs. Ithaca offers a low

cost of living and a high quality of life.

Send resume to:

President

BEAM Engineering and Applied Research

c/o Search 102

205 W. Court St.

Ithaca NY 14850

------------------------------

From: C.B. Vreugdenhil <C.B.Vreugdenhil@fys.ruu.nl>

Date: Wed, 23 Nov 1994 09:51:35 +0100

**Subject: New Book on Numerical Methods for Shallow-water Flow**

New book.

Numerical methods for shallow-water flow

by C.B. Vreugdenhil

Kluwer Academic Publishers, Dordrecht 1994

ISBN 0-7923-3164-8

261 pages

Price Dfl 185

Shallow-water problems occur in a wide variety, such as atmospheric flows,

tides, storm surges, river and coastal flows, lake flows, tsunamis.

Numerical simulation is an effective tool to solve them and a great

variety of numerical methods are available. The first part of the book

summarizes the basic physics of shallow-water flow needed to use numerical

methods in various conditions. The second part gives an overview of

possible numerical methods, not only with their stability and accuracy

properties but also with an assessment of performance in various

conditions. This enables the reader to make a choice for particular

applications. Correct treatment of boundary conditions (often

neglected) is emphasized. The greater part of the book is about

two-dimensional shallow-water equations but a discussion of the 3-d

form is included. The book is intended for researchers and users

of shallow-water models in oceanographic and meteorological institutes,

hydraulic engineering and consulting. It also provides a major

source of information to applied and numerical mathematicians.

Contents:

1. Shallow-water flows

2. Equations

3. Some properties

4. Behaviour of solutions

5. Boundary conditions

6. Discretization in space

7. Effects of space discretization on wave propagation

8. Time integration methods

9. Effect of time integration on wave propagation

10. Numerical treatment of boundary conditions

11. Three-dimensional shallow-water flow

C.B.Vreugdenhil

Institute for Marine and Atmospheric Research Utrecht (IMAU)

Princetonplein 5

3584 CC Utrecht

The Netherlands

phone +31 30 533167

fax +31 30 543163

email vreugdhl@fys.ruu.nl

------------------------------

From: Ron Boisvert <boisvert@cam.nist.gov>

Date: Mon, 21 Nov 94 17:32:04 EST

**Subject: Contents, Transactions on Mathematical Software**

(Note : Information on TOMS, including complete searchable Table of

Contents of all volumes and upcoming papers, is available on the

World Wide Web at http://gams.nist.gov/toms/.)

Table of Contents

ACM Transactions on Mathematical Software (TOMS)

Volume 20, Number 3 (September 1994)

Patrick F. Cummins and Geoffrey K. Vallis,

Algorithm 732: Solvers for Self-Adjoint Elliptic Problems in

Irregular Two-Dimensional Domains,

pp. 247-261.

Dieter Kraft,

Algorithm 733: TOMP -- Fortran Modules for Optimal Control

Calculations,

pp. 262-281.

Victoria Z. Averbukh and Samuel Figueroa and Tamar Schlick,

Remark on Algorithm 566,

pp. 282-285.

Jorge More and David J. Thuente,

Line Search Algorithms With Guaranteed Sufficient Decrease,

pp. 286-307.

A. G. Buckley,

Conversion to Fortran 90: A Case Study,

pp. 308-353.

A. G. Buckley,

Algorithm 734: A Fortran 90 Code for Unconstrained Nonlinear

Minimization,

pp. 354-372.

K. Kim and J.L. Nazareth,

A Primal Null-space Affine Scaling Method,

pp. 373-392.

Barry W. Brown and Lawrence Levy,

Certification of Algorithm 708: Significant Digit Computation of the

Incomplete Beta,

pp. 393-397.

Carl Taswell and Kevin C. McGill,

Algorithm 735: Wavelet Transform Algorithms for Finite Duration

Discrete-Time Signals,

pp. 398-412.

------------------------------

From: SVJPS@vax.ntp.springer.de

Date: Tue, 22 Nov 1994 21:26:06 +0000 (N)

**Subject: Springer Verlag Journals Preview Service**

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CC Numerische Mathematik ISSN 0029-599X

CC Volume 69 Number 1 (1994) code 211 file T4069001.211

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CC R.S. Varga, Kent

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AU Axelsson-O. Chronopoulos-A-T.

TI On nonlinear generalized conjugate gradient methods.

SO Numer.-Math.. 1994 69(1) P 1.

AB 40690001.211

AU Elsner-L. He-C. Mehrmann-V.

TI Minimizing the condition number of a positive definite matrix by

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SO Numer.-Math.. 1994 69(1) P 17.

AB 40690017.211

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TI Using the L--curve for determining optimal regularization

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AB 40690025.211

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TI Paraxial approximation of ultrarelativistic intense beams.

SO Numer.-Math.. 1994 69(1) P 33.

AB 40690033.211

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TI Local convergence of the (exact and inexact) iterative aggregation

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SO Numer.-Math.. 1994 69(1) P 61.

AB 40690061.211

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TI Boundary element discretization of Poincar\'e--Steklov operators.

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SO Numer.-Math.. 1994 69(1) P 103.

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TI An asymptotically optimal finite element scheme for the arch

problem.

SO Numer.-Math.. 1994 69(1) P 117.

AB 40690117.211

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------------------------------

From: Kearfott R. Baker <rbk5287@interval.usl.edu>

Date: Wed, 23 Nov 1994 09:52:04 -0600

**Subject: Contents: Interval Computations;**

Interval Computations. - 1994. - N 1. - 116 p.

CONTENTS

Mathematical Research

G. Alefeld and G. Mayer

A Computer Aided Existence and Uniqueness Proof

for an Inverse Matrix Eigenvalue Problem 4

W. J. Luther and W. Otten

Verified Inclusion for Eigenvalues of Hill's Equation 28

G. L. Kozina and V. A. Perepelitsa

Interval Spanning Trees Problem:

Solvability and Computational Complexity 42

H. Schwandt

Suboptimal Enclosures for the Interval Buneman Algorithm

for Arbitrary Block Dimension 51

O. B. Ermakov

Solving Systems of Ordinary Differential Equations Using

Adams' Interpolation Method with Guaranteed Accuracy 90

Teaching

G. G. Menshikov

On Different Definitions of Interval Extension:

Problems of Teaching 96

Amendment 99

Bibliography

Bibliography of Soviet Works on Interval Computations.

Part V 100

Requirements for manuscript preparation 110

Requirements for manuscript preparation (in Russian) 111

Addresses of the editorial board members 112

Contents 114

OTHER NEWS:

An updated preliminary program, as well as registration and hotel reservation

forms for the

International Workshop on Applications of Interval Computations

have been placed in the anonymous ftp area of

interval.usl.edu

------------------------------

From: Ake Bjorck <akbjo@math.liu.se>

Date: Wed, 23 Nov 94 17:24:22 +0100

**Subject: Contents, BIT**

CONTENTS

BIT Volume 34, No. 4 (1994)

ISSN 0006-3835

Modeling and velocity stabilization of constrained mechanical systems

Taifun Alishenas and \"Orn {\'O}lafsson, pp. 455--483

Finding minimum height elimination trees for interval graphs in

polynomial time

Bengt Aspvall and Pinar Heggernes, pp. 484--509

An implicit shift bidiagonalization algorithm for ill-posed problems

{\AA}ke Bj\"orck, Eric Grimme, and Paul Van Dooren, pp. 510--534

On the convergence of the multivariate ''homogeneous'' QD-algorithm

Annie Cuyt, pp. 535--545

Theoretical and practical efficiency measures for symmetric interpolatory

quadrature formulas

Paola Favati, Grazia Lotti, and Francesco Romani, pp. 546--557

Least squares fitting of circles and ellipses

Walter Gander, Gene H. Golub, and Rolf Strebel, pp. 558--578

Preconditioning strategies for asymptotically ill-conditioned block Toeplitz

systems

Stefano Serra, pp. 579--594

Acknowledgements of referees p. 595

Index Volume 34 pp.596--598

BIT now accepts papers in LaTeX. For information send email to

the Editor:

{\AA}ke Bj\"orck

Department of Mathematics

Link\"oping University

S-581 83 Link\"oping, Sweden

E-mail: akbjo@math.liu.se

FAX: +46-13 100 746

------------------------------

End of NA Digest

**************************

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