**Today's Topics:**

- Who is Cholesky?
- Reaction-convection-diffusion code wanted
- Hyperbolic PDE's with Nonstandard Boundary Conditions
- Position Available at Weidlinger Associates
- Hans Lewy Fellowship at LBL
- SIAM Student Paper Competition
- Argonne Parallel Programming Classes
- Multigrid Short Course
- Symposium on Preconditioned Conjugate Gradient
- Vienna Conference 2nd Announcement
- Workshop in SVD and Signal Processing

From: Taketomo Mitsui <a41794a@nucc.nagoya-u.ac.jp>

Date: Mon, 5 Feb 90 12:17:46 JST

Who is Cholesky?

Almost all numerical analysts know the Cholesky method (or decomposition,

factorization) for symmetric positive definite matrix. I do, however,

wonder who is Cholesky. We now have quite many monographs on numerical

linear algebra, standard or advanced, classical or modern. As far as I have

investigated, they mention neither the personal data of Cholesky nor the

source of the name of the method. My question still remains unsolvable

on his personal information --- initial name, nationality etc. --- and

his work relevant to the method.

The famous textbook by L. Fox "An Introduction to Numerical Linear

Algebra", Clarendon Press, 1964 seems to be the very beginning of the

naming of Cholesky method (see Chap.4 in the book). It is a regret

that Fox didn't give the bibliographical source of the method. Probably

other authors inherited its naming from the book.

Surely my question turns out to be of historical interest. A Japanese

publisher, who is editing an encyclopedic dictionary on mathematical

science, insists on filling out the full spelling of his name and other

personal data. Does anyone have knowledge on this matter?

Thanks a lot in advance!

T. Mitsui

[Ed. Note: Several years ago, Stanford's Dick Cottle wrote a short

note about Cholesky's background and work. It's a very interesting

story. We'll try to find a copy and include it in next week's News.

In the meantime, you can find a summary in the Notes and Comments

section of Chapter 3 of the LINPACK Users' Guide. --Cleve]

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

From: Michael Mascagni <mascagni@ncifcrf.gov>

Date: Wed, 7 Feb 90 12:00:24 EST

I am looking for a 2D and or 3D code to handle reaction-convection-diffusion

problems. These are nonlinear parabolic partial differential equations and

I want to solve initial-boundary value problems. If you have such a code,

don't send it to me, but please send a description. Also, if you know of a

code you have used, send along the information. I am particularly interested

in public domain packages.

Peter Basser, Biomed. Engg. and Instr. Branch, DRS, NIH, Bethesda, MD

e-mail: basser@fcrfv1.ncifcrf.gov (internet)

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

From: Roland Sweet <rsweet@copper.Denver.Colorado.EDU>

Date: Fri, 9 Feb 90 16:38:31 mst

A friend of mine who works in applications of algebraic methods to

partial differential equations has developed what he thinks is a new

method to solve the following constant coefficient pde boundary value

problem:

Let a and b be real numbers satisfying 4a + b*b > 0 . Given a function

f(x,y), defined on the curve

1 = x*x + b*x*y - a*y*y ,

find the solution(s) of the pde

[-a(d/dx)(d/dx) - b(d/dx)(d/dy) + (d/dy)(d/dy)]u(x,y) = 0

that equals f(x,y) on that curve.

For example, let b=0, a=1, and y=t. Then we seek the solution of the

wave equation

(d/dt)(d/dt)u = (d/dx)(d/dx)u

with the solution specified along the hyperbola

1 = x*x - t*t .

My friend's technique generates a hyperbolic series solution. Does

anyone out there in na-land know of a real problem for which his solution

might be of interest?

Roland Sweet

Mathematics Department

University of Colorado at Denver

e-mail: rsweet@copper.colorado.edu

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

From: Victor Pereyra <pereyra@na-net.stanford.edu>

Date: Sat, 10 Feb 90 13:14:52 PST

A Los Altos, California, firm is looking for qualified individuals

in two positions, to work in areas of computational acoustic, elastic or

electromagnetic wave propagation, including ray tracing and finite element

forward and inverse simulations.

Minimum qualifications for position one are: B.S. in either applied

mathematics or computer sciences with numerical analysis or computer graphics

emphasis, or relevant application fields (geophysics, applied mechanics,

electrical engineering). Experience in the FORTRAN and C languages and UNIX

operating system is required.

Minimum qualifications for position two are: M.Sc. or Ph.D. in addition

to the above qualifications. Published research record and/or experience in

obtaining and managing government or private industry contracts or large scale

computational software projects will be an important plus.

Please send resumes to : Weidlinger Associates, 4410 El Camino Real, Suite 110,

Los Altos, CA 94022. Attention: Dr. V. Pereyra.

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

From: Paul Concus <concus@csam.lbl.gov>

Date: Mon, 5 Feb 90 11:17:12 PST

Hans Lewy Postdoctoral Fellowship in Mathematics

initiated at Lawrence Berkeley Laboratory

A new postdoctoral fellowship in mathematics has been

initiated in the Mathematics Department of the Lawrence

Berkeley Laboratory. The fellowship is intended to enhance

scientific research in the U.S.A. by fostering a young

Ph.D. to work in areas related to the numerical solution of

partial differential equations. Of particular emphasis are

those areas in which the LBL Mathematics Department is

active, such as fluid mechanics, polymer physics, interface

methods, iterative methods, and parallel processing. Con-

comitant interests in the use of advanced-architecture

com puters are encouraged.

The fellowship is named in honor of Hans Lewy, who died

in 1988. Hans Lewy's career spans a half-century with the

Berkeley mathematics community, much of it in the area of

partial differential equations. A part of his work forms

the foundation of the theory of modern difference schemes

for solving evolutionary partial differential equations

numerically.

The first recipient of the Hans Lewy Postdoctoral Fellow-

ship is Jingyi Zhu, who received his Ph. D. last year from

the New York University Courant Institute of Mathematical

Sciences. His work has been in the area of adaptive vortex

methods for viscous, incompressible fluid flow. The fellowship

will be supported by specially designated funds from the

Department of Energy Applied Mathematical Sciences Research

Subprogram, with support initially from the Director's

Exploratory Research & Development Fund at Lawrence Berkeley

Laboratory.

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

From: Michelle Jones <KEARN@wharton.upenn.edu>

Date: Thu, 8 Feb 90 08:55 EDT

SIAM Student Paper Competition

We are pleased to announce the second SIAM Student Paper Competition. If you

have a student or know of a student who should be included in the competition,

here are the details:

The student authors of the three best papers in applied and computational

mathematics submitted to SIAM will be invited to attend its annual

meeting in Chicago, July 15-20, 1990. Each winner must present his/her paper

at the meeting and will receive up to $750 to offset expenses. The winners

will be awarded a calligraphed certificate at a special prize ceremony at the

meeting. Papers must be singly authored to be eligible for consideration.

To qualify, authors must be students in good standing who have not received

their PhDs at the time of submission.

In submitting their work for publication, authors are asked to consider the

SIAM journals.

Submissions must be received by SIAM on or before April 2, 1990

Submissions can be sent by regular mail or fax. Each submission must include

(1) an extended abstract (3-4 pages), double-spaced, in English; (2) the

signature of the author on the submission; (3) a statement by the student's

faculty advisor (also on the submission) that the paper has been prepared by

the author indicated and that the author is a student in good standing; and

(4) a short biography of the student.

Each submission must also include a letter of recommendation from the

student's advisor or department chair. Submissions will be judged on the

basis of originality, applicability, and clarity of exposition.

The winners will be notified by May 30, 1990.

If you have any questions, please contact:

Allison Bogardo

SIAM

3600 University City Science Center

Philadelphia, PA 19104-2688

Telephone: (215) 382-9800

E-mail to siam@wharton.upenn.edu

Fax to (215) 386-7999

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

From: David Levine <levine@antares.mcs.anl.gov>

Date: Mon, 5 Feb 90 12:57:39 CST

The Advanced Computing Research Facility (ACRF) at Argonne National Laboratory

is offering introductory courses on parallel computing to familiarize

potential users with the ACRF multiprocessors and parallel programming in

general. The courses are limited to 22 people on a first come first serve

basis.

Topics to be covered include:

1) Parallelizing compilers.

2) The Monitor and Schedule packages for portable parallel programming.

3) Programming the Butterfly 2.

4) Programming the AMT DAP.

5) Programming the Connection Machine-2.

6) Introduction to the LAPACK project.

The format of the course is alternating lectures and hands-on work

with the parallel computers in the ACRF. Fortran will be emphasized as the

primary programming language. Knowledge of Fortran and Unix will be assumed.

A portion of the third day is available for each attendee to work on their

own particular project.

The schedule of classes for 1990 is:

April 4-6 1990

June 13-15 1990

August 22-24 1990

October 17-19 1990

December 5-7 1990

Parallel computers currently in the ACRF are:

4-processor Ardent Titan

8-processor Alliant FX/8

16-processor Intel iPSC-VX hypercube

20-processor Encore Multimax

24-processor Sequent Balance 21000

32-processor Intel iPSC-1 hypercube

32-processor Butterfly TC2000

1024-processor Active Memory Technology DAP

16384-processor Thinking Machines CM-2

Those interested in the class should contact:

Teri Huml

Mathematics and Computer Science Division

Argonne National Laboratory

Argonne, IL 60439-4844

(312) 972-7163

huml@mcs.anl.gov

There will be a $25.00 registration fee per person for universities,

federal laboratories and government organizations and $100.00 for

commercial organizations.

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

From: Steve McCormick <smccormi@copper.denver.colorado.edu>

Date: Mon, 5 Feb 90 14:26:30 mst

MULTIGRID SHORT COURSE

University of Colorado at Denver

May 14-18, 1990

Principle Lecturer: Achi Brandt

Supporting Lecturers: William Briggs, Jan Mandel, Steve McCormick

Purpose: To provide an understanding of the principles and

procedures for multilevel adaptive methods, especially

for partial differential equations, including new

multigrid approaches in computational fluid dynamics.

Registration Fee: $250 (regular), $75 (student). Includes books

and other course materials, refreshments, computer lab

access.

Topics: Basis tutorial, advanced methods for PDE's (e.g.,

multigrid procedures for general systems, nonlinearity,

ellipticity/nonellipticity, indefiniteness,

discontinuities, singularities, performance

prediction/analysis, constrained optimization, inverse

problems, time dependence, algebraic and introduction to

non-PDE multilevel techniques (e.g., integral and

integrodifferential equations, fast dense matrix

multiplication, many-body interactions, large

determinants, global discrete and highly-nonlinear

optimization, multilevel Monte Carlo in statistical

physics).

For Further Information, Please Contact:

Short Course Secretary

Computational Mathematics Group

University of Colorado at Denver

1200 Larimer Street, Campus Box 170

Telephone: (303) 556-4807 or (303) 556-2341

(e-mail: cliu@copper.colorado.edu)

We have an agreement with The Executive Tower Inn for a special rate of $40

per night. The hotel is just one block from the lecture room. Please contact

them and mention CU-Denver:

Phone: (303) 571-0300

Address: 1405 Curtis Street

Denver, Colorado 80204

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

From: Rami Melhem <melhem@cs.pitt.edu>

Date: Thu, 8 Feb 90 11:42:54 -0500

Symposium on

Preconditioned Conjugate Gradient

Methods and Supercomputing.

The University of Pittsburgh and the Pittsburgh Supercomputing Center

are hosting a syposium on PCCG and Supercomputers, to be held in

Pittsburgh on April 6 and 7, 1990. Invited speakers include

O. Axelson and J. Maubach from the department of Mathematics and

Information Science at the University of Nijmegen, the Netherlands,

and Youcef Saad from RIACS. Contributed talks are solicited in

the areas related to the symposium. Authors are invited to

submit a 200 word abstract of their talk before March 5 to one of

the organizers at the following addresses:

William Layton: Department of Mathematics and Statistics,

301 Thackery Hall, The University of Pittsburgh,

Pittsburgh, PA 15269

wjl@vms.cis.pitt.edu

Rami Melhem: Department of Computer Science

219 MIB, The University of Pittsburgh,

Pittsburgh, PA 15260

melhem@cs.pitt.edu

To receive more details, please contact the organizers.

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

From: Winfried Auzinger <E115N00%AWITUW01.BITNET@Forsythe.Stanford.EDU>

Date: 09 FEB 90 10:02:06

CONFERENCE ON SCIENTIFIC COMPUTATION - SECOND ANNOUNCEMENT

On the occasion of Hans J. Stetter's 60th birthday, a conference will be held

June 14-16, 1990 at the Technical University Vienna, Austria.

Main Topics: ODEs, PDEs, Numerical Software, Validated Computation.

Conference Chair: Christoph W. Ueberhuber, Richard Weiss.

Committee: Winfried Auzinger, Josef Schneid, Ewa B. Weinmueller.

The scientific program will consist of contributed talks only.

There will be morning and afternoon lectures of 20 minutes each.

Talks will be held in parallel.

Potential contributors should submit a one-page abstract (together with their

registration form) to Christoph W. Ueberhuber. This one-page abstract should

include the title and (list of) author(s) in a form suitable for direct

inclusion in the book of abstracts. Please indicate the speaker's name

if there are several authors. LaTeX is preferred but plain ascii and

TeX are acceptable.

Location: The conference will be held at the Technical University Vienna

in the building on Gusshausstrasse 27-29. On June 14, the conference office

will be open from 8:45 a.m., lectures will begin at 9:30 a.m.

Deadline for Submission of Abstracts, for Registration, and for

Hotel Reservations is May 4, 1990. June is high tourist season in

Vienna, so rooms ought to be reserved as early as possible.

For more information, including an electronic registration form

and information about fees and accomodations, please send mail to

e115n00@awituw01.bitnet

or na.auzinger@na-net.stanford.edu

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

From: Rick Vaccaro <vaccaro@quahog.uri.edu>

Date: Fri, 9 Feb 90 09:59:12 EST

Second International Workshop on

SVD and SIGNAL PROCESSING

June 25-27, 1990

University of Rhode Island

Kingston, RI USA

The deadline for submission of paper summaries for the

has been EXTENDED until March 15, 1990.

The Second International Workshop on Singular Value Decomposition (SVD)

and Signal Processing is an outgrowth of a previous workshop of the same

name which was held in Les Houches, France in September of 1987.

The goal of this workshop is to bring together active researchers in

several fields related to the SVD. This workshop is sponsored by

the College of Engineering at the University of Rhode Island in

cooperation with the ASSP Society of the IEEE, with EURASIP, and with SIAM.

CALL FOR PAPERS

Papers are solicited for technical sessions on the following and

related topics:

* Algorithms and architectures for the SVD including parallel

implementation, real-time, and adaptive algorithms.

Complexity, accuracy, and convergence.

* Special purpose signal processing applications such as

array processing, model identification, model reduction,

spectrum analysis, and harmonic retrieval.

* Performance analysis and resolution limits of SVD-based

algorithms.

Other topics related to the SVD and its application are welcome.

Authors are invited to submit three copies of an extended summary

(4 pages max.) to R.J. Vaccaro (address below) for review. Authors

of accepted papers will be asked to prepare a version for publication

in a conference proceedings. All regular sessions will be poster

presentations. In addition, the workshop will include a number of

invited plenary talks on topics of general interest.

CONFERENCE COMMITTEE

Richard J. Vaccaro (Chairman) G. Faye Boudreaux-Bartels

Dept. of Electrical Engineering University of Rhode Island

University of Rhode Island

Kingston, RI 02881 USA Ed F. Deprettere

vaccaro@quahog.uri.edu Delft University of Technology

Gene H. Golub

Stanford University

Franklin T. Luk

Cornell University

Don Tufts

University of Rhode Island

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

End of NA Digest

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