**Today's Topics:**

- Can you be "fingered"?
- Retarded Differential Equations
- Hyperbolic PDEs
- SLI vs Floating-point
- Position Available in Santa Monica
- Position Available at Leeds
- Research Fellowships at Sandia, Albuquerque
- AMS Session on Numerical Linear Algebra
- Contents: Surveys on Mathematics for Industry
- Symposium in Greece on Method of Lines
- IMA Sparse Matrix Workshop
- Nigeria Meeting

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

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

Date: Mon, 2 Sep 91 18:58:25 PDT

**Subject: Can you be "fingered"?**

In the last several months, I have noticed that it is not possible to "finger"

persons at some .com organizations, eg. NEC, AT&T, SGI and some educational

institutions, too. It was possible to finger persons at these institutions in

the past. I think this practice of disabling the finger command is very bad in

the modern age of computer communication.

I have read the book, "Cuckoo's Egg" which described how systems can

be broken into via the finger command. But I would hope this glitch in

the unix system could be eliminated by the system staff.

Why is fingering important? I find it useful to find out if someone has read

their mail of late. Than too many of us have information such as our phone

numbers, FAX numbers and mail addresses in our .plan file. So a lot of helpful

and useful information can be obtained by using the finger command.

(Try finger golub@cholesky.stanford.edu as an example.)

I realize many people are worried about providing such information but

that should be their decision, not the systems administrator. (By the

way, I heard on "All things considered" today that 30% of the

Libertarian Party are "computer people".)

So if you feel similar to me, please complain to your systems person or

whomever has made this decision. It helps us all.

Gene

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

From: Philip Sharp <sharp@cs.toronto.edu>

Date: Wed, 4 Sep 1991 18:31:36 -0400

**Subject: Retarded Differential Equations**

I am collecting practical examples of retarded differential equations. If

you have examples, I would appreciate a reference to or description of

them. I am particularly interested in examples with multiple lags or that

have at least five equations.

I plan to make the collection publicly available.

Thank you.

Philip Sharp

Department of Mathematics and Statistics

Queen's University

Kingston, K7L 3N6

Canada

Tel: (613) 545 2391

Fax: (613) 545 2964

Ema: sharp@na.toronto.edu, sharp@mast.queensu.ca

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

From: Fred Kus <FRED@SSCvax.CIS.McMaster.CA>

Date: Thu, 5 Sep 1991 13:05:00 -0400

**Subject: Hyperbolic PDEs**

Hi,

Does anyone have, or know where I could get, any public domain

software for hyperbolic PDEs in 1, 2 or 3 space dimensions. I

an particularly interested in codes for advective-diffusion

equations.

Thanks.

Fred

Fred W. Kus INTERNET: fred@SSCvax.CIS.McMaster.CA

Computing & Information BITNET: fred@MCMASTER.BITNET

Services PHONE: (416) 525-9140 ext.4160

Mcmaster University FAX (416) 528-3773

Hamilton, Canada L8S 4K1

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

From: F. W. Olver <olver@bessel.umd.edu>

Date: Thu, 5 Sep 91 14:07:32 EDT

**Subject: SLI vs Floating-point**

Daniel Lozier, Peter Turner & I appreciate David Goldberg's reference to

Jim Demmel's critical article in the Proceedings of the Eighth Symposium

on Computer Arithmetic, 1987. This article is in fact mentioned in the

second reference that we supplied in our original letter to the Digest,

and also in more recent papers, for example, SIAM J. Numer. Anal.,v.27,

pp.1295-1304,1990. The arguments advanced by Demmel concerning precision

in the SLI system resemble those that were made by fixed-point advocates

at the time the floating-point system was under consideration. By

analogy, we may expect that the final resolution of these arguments awaits

the construction and extensive use of SLI hardware, followed by the

further development of error analyses that apply directly to the SLI

system.

Frank Olver

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

From: Stanley Osher <sjo@math.ucla.edu>

Date: Tue, 3 Sep 91 08:07:09 -0700

**Subject: Position Available in Santa Monica**

Small, rapidly growing image processing company in Santa Monica,

Ca. seeks Phd. or Master's level people. Should be an excellent

programmer with a strong background in numerical analysis, scientific

computing, partial differential equations and image processing. Please

fax your resume to 213-396-5208, or mail it to 2800-28th St, suite 101,

Santa Monica, Ca. 90405

Stan Osher

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

From: M Berzins <martin@dcs.leeds.ac.uk>

Date: Thu, 5 Sep 91 12:23:03 BST

**Subject: Position Available at Leeds**

Vacant Position in Parallel Scientific Computation.

Postdoctoral Resaerch Fellow in

Parallel Computing (Domain Decomposition).

A two year post available in the School of

Computer Studies Leeds University U.K. to

work on domain decomposition techniques

for the solution of time-dependent p.d.e.s.

The post is available now, standard UK academic

salary applies, informal enquiries

to Dr Martin Berzins, Computer Studies,

Leeds University, LEEDS LS@ 9JT, U.K.

email martin@uk.ac.Leeds.dcs

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

From: John N. Shadid <jnshadi@cs.sandia.gov>

Date: Thu, 5 Sep 91 08:33:58 MDT

**Subject: Research Fellowships at Sandia, Albuquerque**

Sandia National Laboratories invites applications and nominations of

outstanding engineers and scientists for its 1992 Research Fellowships

in the Computational Sciences.

The Sandia Research fellowships will provide an exceptional opportunity

for engineers and scientists performing leading-edge research in the

computational sciences. This year the fellowships will be awarded in the

field of computational fluid dynamics (CFD). Areas of interest include;

large-scale simulation of incompressible fluid flow, computation of complex

chemically reacting flow systems and numerical simulation of oceanic and

atmospheric flows as applied to global climate modeling. In addition to the

fellowships, several post-docs will also be offered.

Sandia's Mathematics and Computational Science Department maintains strong

programs in CFD, computational physics and engineering, analytical and

computational mathematics, advanced computational approaches for parallel

computers and scientific visualization. Sandia provides a unique parallel

computing environment, including a 1024-processor nCUBE 3200 hypercube, a

1024-processor nCUBE 6400 hypercube, a Connection Machine CM-2X, a 64

processor Intel iPSC 860, and several large Cray supercomputers. The

successful candidate must be a U.S. citizen, must have an earned doctorate

in the sciences, and should have made a strong contribution in CFD or

related fields.

The fellowship appointment is for a period of one year, and may be renewed

for a second year. It includes a highly competitive salary, moving expenses,

and a generous professional travel allowance. Applications from qualified

candidates, or nominations for the fellowships, should be addressed to

Sudip Dosanjh, Supervisor Parallel Computational Science Division 1421,

Sandia National Laboratories, PO Box 5800, Albuquerque, NM 87185.

Applications should include a resume, a statement of research goals, and

the names of three references. The closing date for applications is

November 30, 1991. The positions will commence during 1992.

John Shadid

Sandia Nat. Labs.

Albuquerque, NM 87185

(505) 844 - 5621

jnshadi@cs.sandia.gov

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

From: Daniel Szyld <szyld@euclid.math.temple.edu>

Date: Sun, 01 Sep 91 10:29:56 IST

**Subject: AMS Session on Numerical Linear Algebra**

There will be a Special Session on Numerical Linear Algebra at

the American Mathematical Society (AMS) meeting 868, in Philadelphia,

October 12-13, 1991. Listed below are the speakers and the title

of their presentations. Abstracts of these talks will appear in the

Abstracts of the AMS before the conference. Further information,

including hotel information and travel directions can be found in the

Notices of the AMS. You can also contact the session organizer:

Daniel B Szyld, Department of Mathematics, Temple University 038-16,

Philadelphia, PA 19122-2585, e-mail : szyld@euclid.math.temple.edu

Jesse L. Barlow Error Analysis of Update Methods for the Symmetric

Eigenvalue Problem

Ralph Byers Numerical Computation of an Analytic Singular

Value Decomposition of a Matrix Valued Function

Howard Elman Parallel Implementation of the hp-version of the

Finite Element Method on a Shared-Memory Architecture

Anne Greenbaum Laplace's Equation and the Dirichlet-Neumann Map

in Multiply Connected Domains

Linda Kaufman Modifying the Shougen-Shuqin algorithm for the banded

Symmetric Generalized Matrix Eigenvalue Problem

Ivo Marek Convergent Iterative Methods to Find Stationary

Distribution of Markov Processes

Carl D Meyer Errors in Aggregadtion/disaggregation for Markov Chains

Michael Neumann Asynchronous parallel iterations for nonlinear systems

Michael Overton On the Convex Hull of Projection Matrices

Ricardo Pantazis Parallel Solution of Generalized Band Symmetric

Eigenvalue Problems by Sectioning

Mordukh Primak A projection cutting plane algorithm for convex

programming problems

Lothar Reichel A new implementation of the GMRES method

G.W. Stewart Updatable, Rank-Revealing Decompositions

William Stewart SOR for Markov Chains Problems

Gilbert Strang Joint Stability of Two Matrices and their Joint

Spectral Radius

L. N. Trefethen Eigenvalues and pseudo-eigenvalues of nonsymmetric

random matrices

Olof B. Widlund Some Recent Results on Schwarz Type Domain

Decomposition Algorithms

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

Sender: Heinz W. Engl <K310773%ALIJKU11@CUNYVM.CUNY.EDU>

Date: Wed, 04 Sep 91 09:37:48 SDT

**Subject: Contents: Surveys on Mathematics for Industry**

Surveys on Mathematics for Industry, Vol.1 No.2, Contents:

C.Cercignani, Mathematical models in rarefied gas dynamics

D.Hartmann, G.Kern, Wind-induced vibrations on high-voltage overhead lines

Subscription information and inspection copies:

Springer Verlag

POBox 89

A-1201 Vienna, Austria

Substantially reduced personal subscriptions for members of:

- DMV

- ECMI

- GAMM

- Japanese SIAM

- OeMG

- SIMAI

Inquire with your society!

Heinz W. Engl, Linz (Managing Editor)

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

From: vasili@math.utk.edu

Date: Wed, 4 Sep 91 09:55:46 -0400

**Subject: Symposium in Greece on Method of Lines**

ATHENS INTERDISCIPLINARY OLYMPIA 91

First International Symposium

on

Methods of Lines, Surfaces and Dimensional Reductional

in Computational Mathematics and Mechanics

November 12-16, 1991

University of Athens, Greece.

SCIENTIFIC COMMITTEE:

J.H. Argyris (Germany), I. Babushka (USA), A. Bacopoulos (Greece),

M. Baines (UK), M. Berzins (UK), Ph. Ciarlet (France),

Y.K. Cheung (Hong Kong), C. Dafermos (USA), P. Deuflhard (Germany),

I.St. Doltsinis (Germany), V.A. Dougalis (Greece), I.S. Duff (UK),

I. Farago (Hungary), J.E. Flaherty (USA), D.G. Gordeziani (USSR),

Ya. M. Grigorenko (USSR), P.J. van der Houwen (NL), J.M. Hyman (USA),

C. Johnson (Sweden), I. Kevrekidis (USA), J.L. Lions (France),

G.I. Marchuk (USSR), T. Miyoshi (Japan), G.C. Papanicolaou (USA),

L.R. Petzold (USA), O. Pironneau (France), A. Quarteroni (Italy),

J.I. Ramos (USA), N. Satofuka (Japan), C. Schwab (USA),

R. Temam (France), L. Turchak (USSR), L.R.Volevich (USSR),

L.S. Xanthis (UK).

CALL FOR PAPERS AND PAPTICIPATION

The symposium will be held in Athens and Ancient Olympia.

It is organised by the University of Athens, Greece, and

the Sir George Cayley Institute - Polytechnic of Central London, England.

The theme of the symposium focuses on various semi-discrete,

semi-analytic or discrete dimensional reduction methodologies,

e.g. methods of lines, finite strips, finite volume, inertial manifolds,

domain decomposition, etc., applied to problems in solid and fluid

mechanics and other fields of science and engineering. These often

imply the formulation of a set of ordinary or partial differential

equations approximating the original systems of governing equations,

which are ultimately solved on serial, vector or parallel computers.

The aims of the symposium are to promote interdisciplinary communication

leading to a better understanding of the underlying links between these

methodologies, to review past and present achievements, to identify

areas for new research with potential impact on future applications,

and to collect this accumulated knowledge in a unique reference volume

(of peer reviewed papers) to be published soon after the symposium.

The lecturers of the symposium are several internationally distinguished

researchers who have accepted invitations to participate and present

their work.

Abstracts outlining original papers are requested from potential

authors who should contact the Scientific Secretariat at the earliest

time. The number of authors and participants is limited,

therefore an early registration is urged to secure a place.

Abstracts are due before 15 September 1991.

Registration close: 15 October 1991

Scientific Secretariat

L S Xanthis (Director)

Sir George Cayley Institute for Computational Mechanics

The Polytechnic of Central London

115 New Cavendish Street London W1M 8JS

Tel: 071-911 5000 Fax: 071-911 5089

E-mail:Xanthisl@sun.pcl.ac.uk

OUTLINE OF PROGRAMME

Monday, 11 Nov 91

Registration: at 30 Panepistimiou Street, Athens;

Reception: at the courtyard of the Museum of the History of

Athens University in Plaka-Old Athens, beneath the Acropolis hill.

Tuesday-Wednesday-Thursday, 12-13-14 Nov 91

Athens Technical Sessions: Keynote, Invited and Contributed Lectures;

Visits: Poseidon's Temple at sunset and other sites

of archaeological interest.

Friday-Saturday, 15-16 Nov 91

Olympia Cultural Sessions: Transfer to Ancient Olympia

(legendary scene of first Olympic games)

via Delphi (an awesome setting for an oracle);

Lectures embracing the scientific and humanistic cultures

at the Olympic Academy;

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

From: John R. Gilbert <gilbert@parc.xerox.com>

Date: Fri, 6 Sep 1991 09:43:04 PDT

**Subject: IMA Sparse Matrix Workshop**

Sparse Matrix Computation:

Graph Theory Issues and Algorithms

October 14-18, 1991

Minneapolis, Minnesota

Abstract:

Attempts to solve efficiently very large sparse systems

of equations have spawned a multitude of important and

interesting problems. Some of these problems are numerical,

some are combinatorial, some can be phrased in terms of

questions about graphs, and some are "core computer science"

questions, involving the design and implementation of good

(and sometimes provably optimal) data structures. The purpose

of this workshop is to bring together people who work in

sparse matrix computation with those who conduct research in

applied graph theory and graph algorithms.

The workshop will consist of 14 one-hour invited talks, as

well as less formal problem sessions, working papers, and

software demonstrations. The workshop is open to all

interested participants. There is no registration fee, but

attendees are advised to call the IMA to make arrangements

for lodging as soon as possible. (See "Lodging" below.)

The workshop is sponsored by the Institute for Mathematics

and its Applications at the Univeristy of Minnesota, as

part of its Special Year on Applied Linear Algebra.

Organizers:

Alan George (Waterloo; jageorge@provost.uwaterloo.ca)

John Gilbert (Xerox PARC; gilbert@xerox.com)

Joseph Liu (York; joseph@cs.yorku.ca)

Invited Speakers:

Ajit Agrawal (Brown).

Provably good elimination orderings using nested dissection.

Cleve Ashcraft (Boeing).

The aggregate/element model for column-based parallel sparse Cholesky.

Eleanor Chu (Waterloo).

A robust ICCG algorithm for sparse symmetric positive definite systems.

Stan Eisenstat (Yale).

Structural representations of sparse Schur complements.

Steve Kratzer (Supercomputing Research Center).

Massively parallel sparse matrix computation.

Gary Miller (Carnegie-Mellon).

A geometric approach to graph separators with applications to

sparse matrix computation.

Esmond Ng (Oak Ridge).

On symbolic Cholesky factorization.

Barry Peyton (Oak Ridge).

On finding miminum-diameter clique trees.

Paul Plassman (Argonne).

An efficient parallel iterative solver for large sparse linear systems.

Alex Pothen (Penn State).

Predicting the structure of sparse orthogonal factors.

Don Rose (Duke).

Numerical analysis of circuit simulation: The culture of CAzM.

Rob Schreiber (RIACS).

Are sparse matrices poisonous to highly parallel machines?

Pravin Vaidya (Illinois).

Constructing provably good cheap preconditioners for certain symmetric

positive definite matrices.

Steve Vavasis (Cornell).

Nested dissection for sparse nullspace bases.

Schedule of talks (still slightly fluid):

Monday Tuesday Wednesday Thursday Friday

Oct 14 Oct 15 Oct 16 Oct 17 Oct 18

9:15-10:15 am Agrawal Peyton Miller Ng Kratzer

10:30-11:30 am Schreiber Ashcraft Plassman Vavasis Chu

1:30- 2:30 pm Eisenstat Vaidya Pothen Rose

3:00- 5:00 pm ...Demos, working papers, problem sessions...

The workshop will conclude at noon on Friday Oct 18.

Lodging:

Housing for IMA workshops is arranged at the Days Inn Hotel. Anyone interested

in attending the workshop should call the IMA office, 612-624-6066, to request

a reservation at the Days Inn. A special rate of $34.00 plus tax has been

arranged for IMA workshop participants. Please call ASAP to insure that hotel

space is available.

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

From: Bob Russell <russell@cs.sfu.ca>

Date: 8 Sep 91 0:12 -0700

**Subject: Nigeria Meeting**

NA-Net members:

The message below from Simeon Fatunla has just reached me.

If there is the possibility that you could come to the

meeting it discusses, or if you simply would like to have

more information about it, I will try to handle your in-

quiries as quickly as possible. Thanks, Bob Russell

CALL FOR PAPERS

CONFERENCE ON SCIENTIFIC COMPUTING

BENIN-CITY, NIGERIA

JANUARY 27 - 31, 1992

Main Topics:

Ordinary Differential Equations

Partial Differential Equations

Parallel Methods

Interval Arithmetic

Computational Fluids

Non-linear Dynamical Systems and Chaos

Numerical Software

Seismic Analysis

Supercomputing

Computational Meterology

Computer Algebra

Preliminary List of Guest Speakers

Jim Verner (Kingston, CANADA)

John Pryce (Swindon, ENGLAND)

Sean Mckee (Glasgow, SCOTLAND)

K Dekker (Amsterdam, HOLLAND)

M N Spijker (Leiden, THE NETHERLANDS)

Emilo Spedicato (Bergamo, ITALY)

Bob Russell (Burnaby, CANADA)

M Nakashim (Kagoshima, JAPAN)

R O'Malley, Jr (Seattle, USA)

M Rump (Hamburg, GERMANY

Victor Pereyra (Los Altos, USA)

Peter Van Der Houwen (Amsterdam, THE NETHERLANDS)

C O A Sowunmi (Ibadan, NIGERIA)

M A Ibiejugba (Ilorin, NIGERIA)

Philip Sharp (Kingston, CANADA)

Peter Onumanyi (Ilorin, NIGERIA)

S Ibiyemi (Ilorin, NIGERIA)

T Tsuboi (Kyoto, JAPAN)

R O Ayeni (Ogbomosho, NIGERIA)

Dan Kannan (Athens, USA)

K Aderogba (Lagos, NIGERIA)

Akin Ojo (Ibadan, NIGERIA)

Organization

International Steering Committee:

S O Fatunla (Benin-City, NIGERIA)

Bob Russell (Burnaby, CANADA)

John Pryce (Swindon, UK)

Supporting Institutions:

Federal Ministry of Education; Lagos, NIGERIA

Federal Ministry of Science and Technology, Lagos, (NIGERIA)

National Mathematics Centre, Abuja; NIGERIA

International Centre for Theoretical Physics, Trieste; ITALY

Mathematical Association of Nigeria

Format

The conference language is English. The scientific program will

consist of invited and contributed talks. There will be morning

and afternoon lectures of 60 minutes for invited lectures and 20

minutes for contributed papers.

How to contribute

Potential contributors should submit a one-page abstract

(together with their registration form) to Fatunla, Russell, or

Pryce. The 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. If possible; submit abstracts by e-mail to

Professor Bob Russell, Department of Mathematics and Statistics,

Simon Faser University, CANADA; e-mail: russell@cs.sfu.ca or Dr.

John Pryce, Computational and Applied Mathematics Group, Royal

Military College, Shrivenham, Swindon, England e-mail:

pryce@rmcs.cranfield.ac.uk or by TELEX to Simeon Fatunla at

41365 UNIBEN NG

Deadline for Submission of Abstracts is November 30, 1991.

Book of Abstracts and Proceedings

A collection of all abstracts will be available to attendees at the

conference. There will be a proceeding of the conference. Two

copies of papers typeset with TEX and LATEX and on a diskette

should be made available at Registration.

Locations

The conference will be held at the University of Benin Auditorium.

On January 26th, the conference office will open from 4.00 pm.

Lectures will begin at 10.00 on January 27, 1992.

Benin City, NIGERIA Professor Simeon Ola Fatunla

Telex: 41365 UNIBEN NG (Director of Conference)

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

End of NA Digest

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