NA Digest Sunday, June 7, 1998 Volume 98 : Issue 21

Today's Editor:
Cleve Moler
The MathWorks, Inc.

Submissions for NA Digest:

Mail to

Information about NA-NET:

Mail to

URL for the World Wide Web:

From: Nick and Anne Trefethen <>
Date: Sat, 6 Jun 1998 14:15:11 +0100 (BST)
Subject: Two Weddings

Nick Higham and Francoise Tisseur were married in Francoise's
home town of Veauche, near Saint-Etienne, France, on Saturday,
May 30. The service was bilingual and beautiful, with Des Higham
as best man, and the party afterwards lasted most of the night. Rich
and Leslie Lehoucq were there too, having themselves tied the knot only
one week earlier. Congratulations to all four! Photos of the Higham
wedding at

Nick and Anne Trefethen


From: William Scott Hoge <>
Date: Fri, 5 Jun 1998 15:49:04 -0400 (EDT)
Subject: Norm Minimization Question


I am a graduate student at Northeastern University, Boston, MA, and I
have a problem which relates to some image reconstruction work. I am
curious if anyone in the na community has encountered a similar one.

The problem relates to the choice of a matrix X which minimizes the
following norm.

X_{min} = argmin_{X} || S .* ( A - A X X^{\dagger} ) ||


1) A is NxN, X is NxM with M<N
2) The norm is the Frobenious norm.
3) .* indicates element-by-element matrix multiplication (Schur product).
4) S is a masking matrix (i.e. ones in the region of interest,
zeros otherwise, or a 2D windowing function ).
5) A has no special properties other than being real valued (it is not
symmetric or positive definite).
6) in some cases X may be constructed from orthonormal columns such
that the pseudo-inverse can be written as, X^{\dagger} = X' .

Has anyone seen or have any leads to a solution of this type of problem?

Thank you in advance.

Wm. Scott Hoge
Communications and Digital Signal Processing Group
ECE Dept. - Northeastern University


From: Wolfgang Marquardt <wma@lfpt.RWTH-Aachen.DE>
Date: Sun, 31 May 1998 17:40:44 +0200
Subject: Piecewise Polynomial Approximation

I am looking for a software package which solves the following problem:

Given a scalar nonlinear expression y = f(x_1, ... x_n) or alternatively
0 = F(x_1, ..., x_n, y). f is sufficiently smooth function of n>2 arguments
x_i, i=1, ... n.

We want to compute a piecewise polynomial approximation of f in a given
domain for the arguments x_1, ..., x_2. The approximation must be continuous
and differentiable everywhere. The approximation error in the function itself
and in its first derivatives should be controlled (in some norm) by a user
specified bound.

The code should deliver the grid points (in case of adaptive gridding) and the
polynomial coefficients for the given function and domain.

Thank you very much for your help.

Wolfgang Marquardt
Lehrstuhl fuer Prozesstechnik
RWTH Aachen
Turmstr. 46
52064 Aachen

Tel.: +49 (0)241-80-6712
Fax: +49 (0)241-8888-326


From: Dave Smith <>
Date: Thu, 4 Jun 1998 11:13:07 -0700
Subject: Multiple Precision Package

Dear Colleagues,

Version 1.1 of my FMLIB package of Fortran routines for multiple
precision computation is now available. Version 1.0 appeared in
Transactions on Mathematical Software 17 (1991) 273 -- 283. The
new version has improved speed for many of the original operations,
as well as support for multiple precision integer and complex
arithmetic and functions.

There is also a Fortran-90 module that defines three derived types:
multiple-precision real, multiple-precision integer, and
multiple-precision complex. Interfaces are provided so that a program
can declare variables to be multiple-precision types and then write
the code for multiple-precision operations using normal Fortran

The code for these routines, along with several test and sample
programs, may be obtained from

Dave Smith


From: Allison Bogardo <>
Date: Fri, 05 Jun 98 11:49:50 -0500
Subject: Theodore von Karman Prize

SIAM will present the Theodore von Karman Prize at the 1999
SIAM Annual Meeting in Atlanta, Georgia, May 12-15. The
award will be given for a notable application of mathematics
to mechanics and/or the engineering sciences made during the
five to ten years preceding the award. The award may be
given either for a single notable achievement or for a
collection of such achievements.

The award consists of a hand-calligraphed certificate and a
$1,000 cash prize. Expenses for the winner to attend the
annual meeting to receive the award will be borne by SIAM.

Further information about the award, including past winners
may be found at

A letter of nomination, including a description of
achievement(s) should be sent by September 1, 1998,
preferably by email to:

von Karman Prize Selection Committee
c/o Allison Bogardo
3600 University City Science Center
Philadelphia, PA 19104-2688
Telephone: 215-382-9800
Fax: 215-386-7999

The selection committee consists of Professors
Jerrold E. Marsden (Caltech, Chair),
Philippe G. Ciarlet (Laboratoire d'Analyse Numerique, Paris),
and Joseph B. Keller (Stanford University).


From: Volker Schulz <>
Date: Thu, 4 Jun 1998 16:07:02 +0200 (METDST)
Subject: Special issue of JCAM

Special Issue of the
Journal of Computational and Applied Mathematics


Guest Editor: Volker H. Schulz,
ICA3, University of Stuttgart, Germany

Deadline for Submission of Full Papers: November 30, 1998
Expected Publication: Spring 1999

The numerical solution of optimal control problems is at the
core of many industrial engineering projects. Typically these
problems evolve from simulation tasks defining some output
states to be influenced by some input controls. During the
last years a number of numerical methods have been established,
which treat the states and controls together as unknowns of a
discretized finite dimensional constrained optimization problem
and apply SQP-type methods. Despite the resulting large number
of variables this approach has proven very successful.

The aim of this special issue is to highlight certain aspects of
this approach in the context of ordinary as well as of partial
differential equations (i.e. optimal control in ODE/DAE/PDE).
This special issue will contain papers presenting new research
results in topics including, but not limited to:

* Direct discretization methods
* Fast solution methods for discretized optimal control problems
* Solution error approximation and control
* Shape optimization
* Inverse modeling / parameter estimation
* Optimum experimental design
* Off-line control
* Feedback control
* Nonlinear model predictive control
* Applications in industry and/or science & engineering

All papers will be refereed. All people working in research fields
as listed above are encouraged to submit a contribution according
to the theme of this special issue.

More information regarding submission of papers can be obtained at


From: Juha Haataja <>
Date: Thu, 4 Jun 1998 09:28:15 +0300 (EET DST)
Subject: Course Material on Computational Science

Center for Scientific Computing (Finland) organized an Intensive Course
on Computational Science on May 25-29, 1998.

Slides and other course material is now available at the WWW address

Most of the material is in Adobe Acrobat PDF format.

The course consisted of about 50 hours of lectures and exercises, and
a project work. There were 20 participants from universities,
government, and industry. The course was primarily targeted to
students and researchers in chemistry and biosciences. The course
taught general skills such as mathematical modelling, numerical
methods, use of software, and program development.

After the course, the participants have a working knowledge of the
numerical methods used in standard software packages. In addition,
they are ready to participate in program development projects, at
least on the level of using subroutine libraries to solve specific
subtasks of the problem. Also, participants are familiar with the
capabilites of Matlab and Mathematica, which are standard tools for
prototyping and solving mathematical problems.

Juha Haataja, CSC


From: Andrew Leung <>
Date: Mon, 1 Jun 1998 16:07:33 BST
Subject: Conference on Dynamics, Monitoring and Control


First International Conference on the Integration of Dynamics,
Monitoring and Control Manchester, UK 1-3 September 1999

"Integrating Dynamics, Condition Monitoring and Control for the 21st

Web site:

In a growing range of industries, such as aerospace, automotive,
process, power and manufacturing, there is an increased need for the
integration of dynamics, condition monitoring and advanced control.

There is an overlap between many of the technologies involved, and
this conference aims to bring together academics and practising
engineers from a range of supporting disciplines in these fields.

Papers are welcome which cover applications of these technologies
and/or which report fundamental research which could be relevant to
future design and operation of integrated engineering systems of all
types, and also those which bridge these technologies in a range of
engineering applications.

Dynamics: Linear and non-linear dynamics; noise; vibro-acoustics;
dynamic testing and identification; smart structures;

Control: Advanced control; model predictive control; intelligent
control; active control of noise and vibration; process control;
adaptive control

Condition monitoring: Condition based maintenance; fault diagnosis;
fault detection; risk assessment; structural health monitoring

Integration and supporting technology: Smart sensors ; Fieldbus;
metrology; advanced signal processing; neural networks; multivariate
statistics; data compression and fusion; optimisation; system


January 15 1999 Submission of Abstracts
February 15 1999 Notification of acceptance
May 15 1999 Submit camera ready copy
May 15 1999 Early registration discount


Authors are invited to submit an abstract (400-800 words) by January
15, 1999, to:

Dr Andrew Starr
Conference Secretary, DYMAC'99
Manchester School of Engineering
The University of Manchester
Oxford Road
Manchester M13 9PL, UK
Tel (+44) 161 275 4302
Fax (+44) 161 275 4346
E mail:


From: Beatriz Moreno <>
Date: Wed, 3 Jun 1998 15:23:30 -0500 (CUBA)
Subject: Institute of Cybernetics, Mathematics and Physics

The Institute of Cybernetics, Mathematics, and Physics (ICIMAF) is
pleased to announce the International Conference CIMAF99 under the
theme Science and Technology for Development. The Conference is aimed at
fostering a fruitful, long-lasting exchange of ideas and knowledge on
current problems of crucial importance for the development of our
The Conference will feature the following events :
5 th. Mathematics Symposium.
1 st Workshop on Combinatory, Geometry, Coding Theory and Related Areas.
1 st Workshop on Numerical Analysis and Differential Equations.
9 th. Cuba -Mexico Statistics Meeting.
4 th. Ibero - American Pattern Recognition Symposium..
2 nd. Workshop on Quantum Mechanics, Particles and Fields.
3 rd. Ultrasonic Symposium.
2 nd. Artificial Intelligence Symposium.
2 nd. Automatic Control Symposium.
2 nd. Telematics Symposium.
2 nd. Meeting on Current Trends in Research and Development Management.

For further information please contact :
Mrs. Carmen Seara Alvarez.
Calle 15 No. 551 e/ C y D Codigo Postal 10400.
La Habana Cuba.
Tlx.512230 icimaf cu
Fax(537) 33 33 73
Tel.(537) 33 33 73, 32 77 64 and 32 26 88

Scientific Program :
Dr. Manuel Lazo Cortes.
Calle 15 No. 551 e/ C y D Codigo Postal 10400.
La Habana, Cuba.
Fax(537) 33 3373.
Tel.(537) 33 3373, 32 7764, 32 2688 and 32 4567.

Professional Congress Organizer :
Mrs. Alicia Garcia Gonzalez.
Palacio de las Convenciones.
Codigo Postal 16046
La Habana, Cuba.
Tlx. 51 16 09 Palco cu.
Fax.(537)22 8382 and 21 9496.
Tel. (537) 21 5199.


From: Endre Suli <>
Date: Thu, 4 Jun 1998 14:57:34 +0100 (BST)
Subject: Foundations of Computational Mathematics

Foundations of Computational Mathematics Conference
Oxford University, U.K.
July 18-28, 1999


Oxford University is hosting the Foundations of Computational
Mathematics Conference (FoCM99) in July 18-28, 1999. The mission of
the meeting is to establish a common agenda between computation, pure
mathematics and computer science. While presenting plenary talks by
foremost world authorities and maintaining the highest technical level
in workshops, the emphasis will be on multidisciplinary interaction
across subjects and disciplines, in an informal and friendly atmosphere.

The overall oversight of FoCM99 is the responsibility of the FoCM
Executive Committee whose current Chair is Arieh Iserles (University
of Cambridge). The organisation of the 1999 meeting is managed by the

John Ball (Oxford), Richard Brent (Oxford), Chris Budd (Bath),
Mike Giles (Oxford), Nick Gould (Rutherford-Appleton Labs),
Nick Higham (Manchester), Bill McColl (Oxford),
Endre Suli (Chair, Oxford), Nick Trefethen (Oxford)


John BALL (Oxford University, UK)
Ingrid DAUBECHIES (Princeton University, USA)
Jean Pierre DEDIEU (Universite Toulouse, France)
Alan EDELMAN (Massachusetts Institute of Technology, USA)
Joos HEINTZ (Universidad de Buenos Aires, Bazil)
Nick HIGHAM (University of Manchester, UK)
Jorge NOCEDAL (Northwestern University, USA)
Erich NOVAK (Universitat Erlangen, Germany)
Peter OLVER (University of Minnesota, USA)
Bjorn POONEN (University of California at Berkeley, USA)
Rolf RANNACHER (Universitat Heidelberg, Germany)
Jesus Maria SANZ-SERNA (Universidad de Valladolid, Spain)
Guillermo SAPIRO (University of Minnesota, USA)
Andrew STUART (Stanford University, USA)
Denis TALAY (INRIA Centre de Sophia Antipolis, France)
William THURSTON (University of California at Davis, USA)
Leslie VALIANT (Harvard University, USA)
Shing-Tung YAU (Harvard University, USA)

WORKSHOPS and their organisers:
* Analysis and approximation of infinite-dimensional problems
John Ball (Oxford) and Endre Suli (Oxford)
* Approximation theory
Ron DeVore (South Carolina) and Allan Pinkus (Haifa)
* Complexity theory, real machines and homotopy
Jean-Pierre Dedieu (Toulouse) and Pascal Koiran (Lyon)
* Computational Dynamics
John Guckenheimer (Cornell) and Robert MacKay (Cambridge)
* Computational geometry and topology
David Epstein (Warwick) and David Gabai (Caltech)
* Computational number theory
Richard Brent (Oxford) and Henri Cohen (Bordeaux)
* Geometric integration and computation on manifolds
Chris Budd (Bath) and Hans Munthe-Kaas (Bergen)
* Information-based complexity
Stefan Heinrich (Keiserslautern) and Erich Novak (Erlangen)
* Multiresolution, computer vision and PDEs
Vicent Caselles (UIB, Palma) and Wolfgang Dahmen (Aachen)
* Numerical linear algebra
Alan Edelman (MIT) and Nick Higham (Manchester)
* Optimisation
Nick Gould (RAL) and Mike Todd (Cornell)
* Relations to computer science
Laszlo Lovasz (Yale) and Bill McColl (Oxford)
* Stochastic computation
Peter Kloeden (Berlin) and Dominique Picard (Paris-VII)
* Symbolic algebra and computational algebraic geometry
James Davenport (Bath) and Elizabeth Mansfield (Canterbury)

CONTACT INFORMATION: For further information, see:
or e-mail to


From: Pasi Tarvainen <>
Date: Fri, 5 Jun 1998 09:13:42 +0300 (EETDST)
Subject: European Conference on Numerical Mathematics and Advanced Applications

First Announcement
Third European Conference on Numerical Mathematics
and Advanced Applications
July 26 - 30, 1999
Jyvaskyla, FINLAND

Programme Committee

F. Brezzi (Italy) M. Feistauer (Czech Republic)
R. Glowinski (USA/France) R. Jeltsch (Switzerland)
Yu. Kuznetsov (USA/Russia) J. Periaux (France)
R. Rannacher (Germany)

Scientific Committee

O. Axelsson (Netherlands) U. Langer (Austria)
H.G. Bock (Germany) P. Le Tallec (France)
C. Canuto (Italy) K.W. Morton (UK)
M. Griebel (Germany) P. Neittaanmaki (Finland)
C. Johnson (Sweden) O. Pironneau (France)
G. Kobelkov (Russia) D. Talay (France)
W. Wendland (Germany)

Local Organising Committee

P. Neittaanmaki T. Tiihonen
T. Karkkainen T. Rossi
P. Tarvainen


The ENUMATH conferences were established in 1995 in order to provide a forum
for discussion on recent aspects of numerical mathematics. They seek to convene
leading experts and young scientists with special emphasis on contributions
from Europe. Recent results and new trends in the analysis of numerical
algorithms as well as their application to challenging scientific and
industrial problems will be discussed. Apart from theoretical aspects, a major
part of the conference will be devoted to numerical methods for
interdisciplinary applications.


The program of the conference will consist of

* about 10 invited lectures
* about 10 minisymposia on specific topics
* contributed papers (oral presentation)
* a poster session


The conference will be held in Jyvaskyla (Finland) on July 26-30, 1999.

The Conference venue is Jyvaskyla, a lively university and industrial town with
some 80 000 inhabitants. Throughout the year the city offers a rich variety of
cultural events and programmes, and it is also called a paradise of sports and
fitness lovers, as the region offers something for every taste. ENUMATH 99 will
be held on the Mattilanniemi Campus Area of the University of Jyvaskyla. This
area lies within walking distance of the city centre and a range of comfortable
hotels. Dormitory accommodation will also be possible.


The Second Announcement and Call for papers with information about

* Invited Speakers
* Planned Minisymposia
* Submission of Contributions
* Registration Fee and Social Programme
* etc.

will be sent out in October 1998.


Address: Mrs. E. Laiho-Logren
Secretary ENUMATH 99
Department of Mathematics
University of Jyvaskyla
P.O. Box 35
FIN-40351 Jyvaskyla, FINLAND

Tel: +358 14 602732 Fax: +358 14 602731
+358 14 602771

Up-to-date information about the ENUMATH 99 Conference is available at:


From: P. Y. Yalamov <>
Date: Fri, 5 Jun 1998 14:25:53 +0200 (METDST)
Subject: Large-Scale Scientific Computation Workshop in Bulgaria

Second Workshop on

ORGANIZED BY: The Central Laboratory on Parallel Processing,
Bulgarian Academy of Sciences (CLPP-BAS) in cooperation with the Division of
Numerical Analysis and Statistics, University of Rousse (UR), Bulgaria.

Myron Allen (US), Owe Axelsson (NL), Robert Beauwens (BE),
Dario Bini (I), Radim Blaheta (CZ), Peter Binev (BG), Ivan Dimov (BG),
Stefka Dimova (BG), Oleg Iliev (BG), Michael Griebel (D),
Mikhail Kaschiev (BG), Raytcho Lazarov (US/BG), Eugene Tyrtyshnikov (RUS),
Marcin Paprzycki (US), Robert Plemmons (US), Michael Schaefer (D),
Blagovest Sendov (BG), Joachim Stoeckler (D), Lutz Tobiska (D),
V. Voevodin (RUS), Ragnar Winther (NO), Zahary Zlatev (DK);

Owe Axelsson, KUN, Nijmegen, The Netherlands;
Dario Bini, University of Pisa, Pisa, Italy;
Michael Griebel, University of Bonn, Germany;
Raytcho Lazarov, Texas A \& M University, College Station, TX, USA;
Eugene Tyrtyshnikov, Institute of Numerical Mathematics, RAS, Moscow, Russia;
Robert Plemmons, Wake Forest University, Winston-Salem, NC, USA;
Zahary Zlatev, National Environmental Research Institute, Denmark.

(CLPP-BAS), and P. Y. Yalamov (UR).

- Computational Linear Algebra;
- Large-Scale Scientific Computations of Engineering and Environmental Problems

TIME: The workshop is scheduled for June 2-6, 1999, with
arrival on June 1, and departure after midday on June 6.

PLACE: The workshop will be held in the picturesque town of Sozopol, on the
Black Sea coast, 36 km to the south from Burgas (the nearest airport).

SPECIAL SESSIONS: Following the already established tradition, special sessions
will be organized in the framework of the workshop. Participants interested in
organizing such special sessions are invited to contact any of the organizers
or the secretary of the meeting.

To express intent to attend the workshop, please, send a letter, an e-mail
(preferable), or a fax message to the conference secretary (see below).


S. D. Margenov (
P. S. Vassilevski (
Silvia Grozdanova ( - Conference secretary
CLPP-BAS, ``Acad. G. Bontchev'' street, Block 25A,
1113 Sofia, Bulgaria
FAX: (+359 2) 707 273

P. Y. Yalamov (
University of Rousse
7017 Rousse, Bulgaria
FAX: (+359 82) 455 145


From: Trini Flores <>
Date: Fri, 05 Jun 98 08:24:46 -0500
Subject: SIAM Conference on Optimization

Sixth SIAM Conference on Optimization
May 10-12, 1999
Radisson Atlanta Hotel
Atlanta, Georgia

Sponsored by SIAM Activity Group on Optimization

Submissions for minisymposium proposals and contributed abstracts are
welcome. For additional information about the conference, visit


From: Mike Henderson <>
Date: Fri, 5 Jun 98 14:29:48 EDT
Subject: SIAM Workshop on Object Oriented Methods

Second Call for Participation:

SIAM Workshop on Object Oriented Methods for Inter-operable Scientific
and Engineering Computing

October 21-23, 1998
IBM TJ Watson Research Center
Yorktown Heights, New York

This is a reminder that the deadline for submitting papers to this
workshop (June 31), is approaching. The announcement, and details for
submitting can be found at

Mike Henderson


From: Francoise Chatelin <>
Date: Fri, 5 Jun 1998 14:29:33 +0200 (MET DST)
Subject: Research Position at CERFACS

Position at CERFACS

Space missions using altimetry are a major component for the global
monitoring of the oceans. The French-American TOPEX/POSEIDON mission is
the current best example of such an approach. The NASA-CNES JASON
project will follow TOPEX after year 2000 and will have improved performance.
The objective is to know JASON's altitude with a precision of 1 cm rms
(the error level for TOPEX is currently around 3 cm using the DORIS and
Laser tracking systems). JASON will also use DORIS and Laser, as well as
a GPS receiver.
CNES is in charge of the precise orbit determination of JASON. It is thus
necessary to improve the processing of GPS measurements at CNES in order
to reach the required accuracy through a combination of GPS with the other
two systems. Correct use of GPS phase measurements is a keypoint for this

CERFACS has been charged by CNES to develop accurate algorithms to compute
the phase ambiguities associated with the GPS measurements. In this context
we are looking for a researcher at post-doc level with experience, interest,
and background (with publications) in scientific computing to participate
in the development of these algorithms. The position is already open and
should be filled as soon as possible.

The position is in the Qualitative Computing Group at CERFACS, whose main
research activities are
- study of the stability and the reliability of numerical methods,
specifically in the neighbourhood of singularities,
- design of robust codes for computing some eigenelements of very large
and nonnormal matrices (Arnoldi Tchebycheff method),
- influence of high nonnormality on reliability of numerical methods,
- software tools for assessing the quality (reliability, robustness) of
numerical methods.
This group is part of the Parallel Algorithms Project lead by Iain Duff.

For detailed information about CERFACS
URL address :
For more information about Toulouse, the city where CERFACS is located
URL address :
The recruitment procedure is described at the
URL address :

For any question, please send email to


From: Hans Munthe-Kaas <>
Date: Sun, 7 Jun 1998 11:22:27 +0200
Subject: Scholarship at University of Bergen, Norway

PhD project - Numerical analysis on manifolds / Geometric integration

At Department of Informatics, University of Bergen, Norway, a PhD
scholarship is available. The scholarship is open to any area of research
covered by the department, i.e. computer science, numerical analysis and
scientific computing, optimization, coding theory and bio-informatics.

I would like to attract applicants who are interested in
conducting research within one of the following topics:
1) Geometric integration of ordinary and partial differential equations
on manifolds.
2) Applications of symmetry methods in numerical solution of differential
3) Object oriented abstractions in numerical analysis, based on
coordinate free formulations.

These are areas of very active research, and the group in Bergen is
collaborating closely with other groups nationally and internationally.

Candidates must have a strong motivation for learning modern (abstract)
treatments of differential equations. Topics 1) and 2) are suitable for
students with a background in numerical analysis/ applied mathematics.
Topic 3) could be suitable for students with a strong background in
computer science, and who would like to apply techniques like algebraic
specifications/ algebraic programming technology in the area of computational

More info on this project:
or contact me directly.

If you are interested in the scholarship, but NOT in this project, please
do NOT contact me. You will find the necessary information on:

Application deadline: June 17. 1998.

Best regards,

Prof. Hans Munthe-Kaas Email:
Department of Informatics Phone: (+47) - 55584179
University of Bergen FAX : (+47) - 55584199
N-5020 Norway


From: Bo Kagstr|m <>
Date: Mon, 1 Jun 1998 19:28:41 +0200 (MET DST)
Subject: Faculty Position at Umea Univ, Sweden


Umea University on the east coast of northern Sweden is a young and
dynamic university with over 23 000 students and 3900 employees.
Education and research cover a wide and comprehensive field. The
University is expanding in research and development in computational

We now welcome applications for a position as Assistant Professor
of High-Performance and Scientific Computing at the Department
of Computing Science. In addition to pursuing research, the
successful candidate is expected to assist in supervising graduate
students and preferably also in attracting research grants.

In order to qualify for the position you should have a doctoral
degree (or equivalent) which is not more than five years old.
The position is for two years, with a two years prolongation.
The position can optionally be prolonged up to a total of six years
by teaching on under-graduate level.

The successful candidate is expected to work in collaboration
with existing research groups at the Department and the High
Performance Computing Center North (HPC2N). Today research
is conducted in high-performance and parallel computing,
numerical linear algebra with applications, optimization,
differential-algebraic systems of equations, mathematical
and scientific software. We also encourage applicants that
represent other areas of research and applications in
scientific computing.

HPC2N is a national center for scientific and parallel computing
located at Umea University.(See
Umea University offers academic and industrial users access to
leading-edge high-performance computing systems. This includes
a Silicon Graphics Onyx2 with two InfiniteReality2 graphics units,
and a scalable 66-node IBM SP system with 32.5 Gflops/sec.
peak performance. (See

For further information, please contact Professor Bo Kagstrom, Chairman
of the Department of Computing Science, phone: +46-90-786 54 19,
email:, or Professor Per-Ake Wedin, phone:
+46-90-786 54 39, email:

Applications should include a curriculum vitae, copies of degree
certificates, a statement of previous research achievements and
teaching merits, a list of publications, and reprints numbered
according to the list, all in four copies. The application should
be marked dnr 3152-926-98 and sent to Registrator, Umea University,
SE-901 87 Umea, Sweden. Closing date is June 15, 1998.


From: Ekkehard Sachs <>
Date: Thu, 4 Jun 1998 10:39:33 +0200
Subject: Graduate and Postdoctoral Positions at University of Trier

Graduate and Postdoctoral positions
in the
Graduate Program
Mathematical Optimization
University of Trier

Scholarships and postdoc positions in
Mathematical Optimization will become available on

October 1, 1998 or earlier

The main research areas in the graduate program are

- Global Optimization, Multiple Objective Optimization
(Prof. Dr. Reiner Horst)

- Computational Complexity
(Prof. Dr. Christoph Meinel)

- VLSI-Design and Formal Verification
(Prof. Dr. Christoph Meinel)

- Numerical Methods in Optimization and Optimal Control
(Prof. Dr. Ekkehard Sachs)

- Ill-posed Variational Problems
(Variational Inequalities, Semi-infinite Optimization)
(Prof. Dr. Rainer Tichatschke).

The scholarships are DM 1.600 per month (or higher for
qualified applicants) according to the
regulations of the German Research Foundation (DFG).

The salary for postdocs is DM 2.790 per month.

The letter of application should include

- curriculum vitae, copy of degree certificates,
- short description of prospective research program,
- copies of scientific papers (thesis, etc.),
- letter of recommendation.

The applications should be sent until July 3, 1998 to

Prof. Dr. E. Sachs
Sprecher des Graduiertenkollegs
Mathematische Optimierung
Universitaet Trier
D-54286 Trier

For further information see

or contact the office:

Telephone +49 651 201-3477
Telefax +49 651 201-3973


From: Thomas Hogan <>
Date: Sat, 6 Jun 1998 17:17:50 -0400 (EDT)
Subject: Contents, Journal of Approximation Theory

Table of Contents: J. Approx. Theory, Volume 93, Number 3, June 1998

S. B. Damelin
Converse and smoothness theorems for Erd\H{o}s weights in $L_p$ ($0<p\le\infty$)

Tingfan Xie, Ren Jiang Zhang, and Songping Zhou
Three conjectures on Shepard interpolatory operators

Shusheng Xu
Successive approximate algorithm for best approximation from a polyhedron

Franck Beaucoup
Maximal points of stable and related polynomials

R. Sakai
Convergence of modified Lagrange interpolation to $L_p$-functions
based on the zeros of orthonormal polynomials with Freud weights

Peter Borwein and Tam\'as Erd\'elyi
A Remez-type inequality for non-dense M\"untz spaces with explicit bound

Alexander G. Kulakov
Convergence of weighted polynomial approximations to solutions of
partial differential equations with quasianalytical coefficients

Jian-Hua Wang
Convergence theorems for best approximations in a nonreflexive Banach space

Mitsuhiro T. Nakao, Nobito Yamamoto, and Seiji Kimura
On the best constant in the error bound for the $H_0^1$-projection
into piecewise polynomial spaces

Leszek Plaskota
Average case $L_\infty$-approximation in the presence of Gaussian noise

Author index for Volume 93


End of NA Digest