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

- A Meta-answer
- A Matrix Eigenvalue Problem
- Spheroidal Wave Functions
- Relation between Spectrum of Submatrices and the Full Matrix
- Parallel Matrix Multiplication Routines
- Meschach 1.2 Released
- Adaptive Simulated Annealing (ASA) version 2.19
- Conference on Systems, Control, Information in China
- HERMIS 94: Hellenic Mathematical Society Conference
- 3rd INRIA-SIAM Wave Propagation Conference
- Position at Sandia Labs
- Position at Pacific Northwest Laboratory
- Position at University Paul Sabatier, Toulouse
- Postdoctoral Position at Rutgers University
- Clipper Petition
- Contents, Advances in Computational Mathematics
- Contents, Numerical Algorithms

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

From: Bill Gear <cwg@research.nj.nec.com>

Date: Mon, 14 Feb 94 08:17:36 EST

**Subject: A Meta-answer**

In NA-digest Vol 94, Issue 7, Arne Raeithel writes:

"What kind of "digest" is this, ... Readers Digest ... had questions

AND answers ... . In contrast, the na.digest is nothing but a medium

to post problems, ... "

Good -- I like it that way. The one question I posed to this audience

brought in several answers, some of which were very useful to me. One

person even mailed me a collection of (paper) papers. I doubt that

many other NA-digest readers would have been interested in these

details, (but a couple who were did email me asking to pass on any

good answers I got to my question).

It always seemed to me that the Readers Digest was for people who

wanted someone to provide somple answers for them without the need to

think. (Years ago, a friend of mine liked to say "The Readers Digest

is to literature as Time is to news.) The NA-digest can be a great

stimulant to thinking, let's keep it that way. (Not infrequently a

problem posed on the net helps to while away an otherwise dull

seminar.)

Bill Gear

President

NEC Research Inst. Inc.

4 Independence Way

Princeton, NJ 08540

Inet: cwg@research.nj.nec.com

UUCP: princeton!nec!cwg

PHONE: (609) 951-2500

FAX : (609) 951-2480

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

From: Richard Luczak <luczak@nag.com>

Date: Wed, 16 Feb 94 09:25 CST

**Subject: A Matrix Eigenvalue Problem**

Let A be a tridiagonal matrix of the form

-2 2

1 -2 1

. . .

1 -2 1

2 -2

Matrix A arises in the following eigenvalue problem

\frac{d^{2} u}{dx^2} - \lambda u = 0

with Neumann boundary conditions

u'(0)=a, u'(1)=b

What is the formula for all eigenvalues of matrix A?

Thank you very much for response.

Richard Luczak

email: rl@nag.com

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

From: Manish Malhotra <manish@am-sparc9.Stanford.EDU

Date: Thu, 17 Feb 94 21:25:10 PST

**Subject: Spheroidal Wave Functions**

The separation of the scalar Helmholtz equation in

ellipsoidal coordinates results in spheroidal wave

functions. I am, in particular, interested in the

prolate spheroidal wave functions.

I would be very grateful to get information about

any existing FORTRAN routines for evaluating the

prolate spheroidal "radial" & "angle" functions.

Manish Malhotra, < manish@am-sun2.stanford.edu >

Dept of Civil Engg

Stanford

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

From: Jan S. Hesthaven <jansh@cfm.brown.edu>

Date: Fri, 18 Feb 94 14:01:50 EST

**Subject: Relation between Spectrum of Submatrices and the Full Matrix**

I am currently facing the following problem, for which I hope somebody can give

me some direction along which to continue.

A D E

Consider the following 3 by 3 square block-matrix D B F

E F C

I know that each of the block's is square (5 by 5), symmetric and positive

semi-definit. In fact I know the exact spectrum of each submatrix.

My question is now whether it is possible, given these informations, to give

some bounds on the spectrum of full matrix ?

I should think that Weyl monotonicity theorem could be applied repeatedly to

derive some bounds, but I have not been able to find results on this specific

problem. The regularity of the problem leads me to believe that such results

exist.

Any directions and references will be greatly appreciated.

Best Regards,

J.S. Hesthaven E-mail: jansh@cfm.brown.edu

Division of Applied Mathematics

Brown University

Providence

RI 02912

USA

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

From: Steve Huss-Lederman <lederman@super.org>

Date: Wed, 16 Feb 94 16:48:10 EST

**Subject: Parallel Matrix Multiplication Routines**

I wanted to let people know that there are a number of parallel matrix

multiplication routines available. Below are the ones that I am aware

of that are general, library quality routines targeted for distributed

memory systems. Others are undoubtedly available and I am sorry for

omissions.

- PUMMA routine. This was developed by Choi, Dongarra and Walker at

ORNL. It uses a 2D block scattered data layout. The current version

runs under PICL and the BLACS so it should run on machines that

support either system. It is available from netlib under scalapack.

(See PUMMA: Parallel Universal Matrix Multiplication Algorithms on

Distributed Memory Concurrent Computers by Choi, Dongarra and Walker

to appear in Concurrency: Practice and Experience. An electronic

version is available from netlib under lapack/lawns/lawn57.shar. A

more recent version should be available from

choi@regulus.epm.ornl.gov)

- BiMMeR routine. This was developed by Huss-Lederman, Jacobson, Tsao

and Zhang at SRC. It uses a virtual 2D torus wrap data layout. It

currently runs on the Intel machines and the IBM SP-1. It is

available from paralib at Caltech or from prism@super.org (recommended

source for most recent version). (See Matrix Multiplication on the

Intel Touchstone Delta by Huss-Lederman, Jacobson, Tsao and Zhang to

appear in Concurrency: Practice and Experience. Available via

anonymous ftp from ftp.super.org in pub/prism/wn14.ps)

- PBBLAS routines. Included are matrix multiplication routines. This

is part of the ScaLAPACK distribution available from netlib under

scalapack. (See Level 3 BLAS for Distributed Memory Concurrent

Computers by Choi, Dongarra and Walker in CNRS-NSF Workshop

proceedings, Sept. 1992 for a general overview.)

There are also many papers available that discuss different parallel

matrix multiplication routines and alternatives. References are given

in many papers. Also, a number of other efforts are underway or

completed that look at other matrix multiplication alternatives. I am

not sure what their status is in terms of code that is available for

current generation parallel systems.

Steve Huss-Lederman

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

From: David Stewart < des@thrain.anu.edu.au>

Date: Mon, 14 Feb 1994 12:26:28 +1100

**Subject: Meschach 1.2 Released**

Meschach version 1.2a

Announcement

Meschach is a library of routines written in C for matrix computations.

These include operations for basic numerical linear algebra; routines for

matrix factorisations; solving systems of equations; solving least

squares problems; computing eigenvalues, eigenvectors and singular values;

sparse matrix computations including both direct and iterative methods.

This package makes use of the features of the C programming language: data

structures, dynamic memory allocation and deallocation, pointers, functions

as parameters and objects. Meschach has a number of self-contained data

structures for matrices, vectors and other mathematical objects. It is

publically available under a GNU style copyright agreement.

A new version of Meschach has been developed which has a great many

enhancements, bug fixes, and new features over Meschach v.1.1b.

Meschach is available from netlib, and, for example, the full package can

be obtained by email using

mail netlib@research.att.com

send all from c/meschach

Meschach can also be obtained by anonymous ftp from a number of netlib

mirror sites (e.g. ftp.cs.uow.edu.au, ftp.zib-berlin.de, unix.hensa.ac.uk)

as well as from the home site thrain.anu.edu.au in directory pub/meschach.

For netlib ftp sites, the directory is usually pub/netlib/c/meschach.

The netlib sites have the source code in shell archives; thrain also has

tar and (pk)zip (for MSDOS) versions.

New features:

*** Meschach 1.2 has complex dense matrices and vectors, band (real)

matrices as well as real dense matrices and vectors, permutations and

integer vectors. Complex factorisation routines include complex LU,

complex QR and the complex Schur decompositions.

*** There is a new iteration data structure for more flexible use of the

iterative routines, which have been extended to include GMRES and

conjugate gradients for normal equations, as well as conjugate gradients,

LSQR and CGS, Lanczos and Arnoldi routines.

*** Naming conventions have been made more uniform. There is also

a header file for old files which use the old names, for backward

compatibility.

*** The memory routines now keep a track of memory usage for the

different data structures (# structures & # bytes) so that memory leaks can

be detected and traced. There are also new routines to handle static

workspace variables. In version 1.1, static workspace arrays were

inaccessible to the user, which can be a problem if memory is short.

With version 1.2, static workspace arrays can be removed at will so that

the memory can be used for other objects.

*** These extensions to the Meschach memory system can be further extended

to include the user's own data structures (without modifying the Meschach

source, of course!).

*** The error handler is now extendable so that you can add new classes

of errors to those already handled.

*** Some new matrix functions have been implemented: matrix powers,

polynomials and exponentials.

*** A sparse symmetric indefinite factorisation (sparse

Bunch-Kaufman-Parlett) has been implemented using a Markowitz-style

pivoting strategy.

*** There is on-line documentation and a simple tutorial in ASCII as part

of the source code.

The user manual for Meschach 1.2 is available from

Centre for Mathematics and its Applications

School of Mathematical Sciences

Australian National University

Canberra, ACT 0200

Australia

Fax: Int'l+61+(6)249-5549 from outside Australia

(06)249-5549 from within Austrlia

E-mail: david.stewart@anu.edu.au

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

From: Lester Ingber <ingber@alumni.cco.caltech.edu>

Date: Thu, 17 Feb 1994 04:47:52 -0800

**Subject: Adaptive Simulated Annealing (ASA) version 2.19**

Adaptive Simulated Annealing (ASA) version 2.19

Major Changes Since Version 2.14

Please note the change in the Caltech ftp address for this archive.

All files in

ftp.caltech.edu:/pub/ingber [131.215.48.151:/pub/ingber]

have been moved to

ftp.alumni.caltech.edu:/pub/ingber [131.215.48.62:/pub/ingber]

In response to several complaints, at least for awhile I will attempt

to keep papers in compress (.Z) instead of gzip (.gz) format. Note

that the gzip utility (copies for various machines in

/pub/ingber/UTILS.DIR) will decompress .Z files as well as .gz files.

The latest Adaptive Simulated Annealing (ASA) code and some related

(p)reprints can be retrieved via anonymous ftp from

ftp.alumni.caltech.edu [131.215.48.62] in the pub/ingber directory.

To get on or off the ASA_list e-mailings, just send an e-mail to

asa-request@alumni.caltech.edu with your request. Update notices are

sent to the ASA_list about every month or two, more frequently if

warranted, e.g., in cases of important bug fixes; these notices are the

only e-mail sent to the ASA_list.

Lester

Prof. Lester Ingber

Lester Ingber Research

P.O. Box 857 E-Mail: ingber@alumni.caltech.edu

McLean, VA 22101 Archive: ftp.alumni.caltech.edu:/pub/ingber

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

From: RA340805 <RA340805@HKPCC.HKP.HK>

Date: Mon, 14 Feb 94 20:33 GMT

**Subject: Conference on Systems, Control, Information in China**

FIRST ANNOUNCEMENT

AND CALL FOR PAPERS

International Conference On

"Systems, Control, Information"

Methodologies and Applications

SCI'94

20--22, October, 1994

Wuhan, China

Sponsored and Organized by:

AMSE, International Association for the

Advancement of Modelling and Simulation

Techniques in Enterprises, France

HUST, Huazhong University of Science and Technology,

CHINA

MAIN TOPICS

General methodologies:

1. General theories, mathematical tools

2. System analysis, modelling, identification, simulation

3. Grey systems, fuzzy systems, complex systems, uncertainty analysis,

forecasting techniques

4. Systems synthesis, filtering, control and design, CAD

5. Information processing, communications, images, pattern recognition

6. Computer tools (Hardware and software), including neural networks,

parallel processing, artificial intelligence, expert systems

Examples and applications in all fields of activities:

1. General physics, optics, electronics, eletrotechnics, circuits, instrumenta

tion

2. General solid and fluid mechanics, mechanical systems, robotics, civil

engineering

3. Thermal engineering, energy sources and plants, chemistry, chemical

engineering, energetics

4. Earth, resources, biology, environment, agricultural and biomedical

engineering

5. Production engineering, manufacturing, management

6. Human and socio-economics problems, world future

PAPERS AND DEADLINES

Acceptance on the basis of a submission:

Two copies of a "one page summary".

Language: English.

TO BE SENT TO:

From China: To Prof. Mian-Yun Chen, Dept.of Automatic Control Eng.,

Huazhong University of Science and Technology

Wuhan 430074, China.

Fax: (027)701738

Telex 40131 HBHUT CN.

From other countries:

To Prof. G.Mesnard, President AMSE, 16Av. Grange Blanche, 69160

Tassinla-demi-lune, France

Fax:(33)78345417

Tel:(33)78343604

Telex:389595

DEADLINES for Summaries: May 15, 1994.

The full texts will be accepted up to the conference, but papers received

before June 30, 1994 & accepted after reviewing will appear in the proceeding

and be available at the conference. The Last Announcement & Provisional

Program will be available on June 10, 1994

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

From: Hellenic Math Society <DEMETRI@aueb.ariadne-t.gr>

Date: 16 Feb 94 18:29:06 UT

**Subject: HERMIS 94: Hellenic Mathematical Society Conference**

Second Announcement and Call for Papers

HELLENIC MATHEMATICAL SOCIETY

ATHENS UNIVERSITY OF ECONOMICS AND BUSINESS

DEPARTMENT OF INFORMATICS

2nd HELLENIC-EUROPEAN CONFERENCE ON MATHEMATICS AND INFORMATICS

HERMIS ' 94

(Hellenic-European Research on Mathematics and InformaticS)

September 22 - 24, 1994, Athens, Greece

The 2nd Hellenic/European Conference on Mathematics and Informatics

(HERMIS '94) will be hosted by the Athens University of Economics and Business

(Department of Informatics) located in Athens, Greece.

The main theme within the Conference will be Computer Mathematics and its

applications and special emphasis will be given to Computational Mathematics,

Operational Research and Statistics, Mathematics in Economic Science.

Invited Speakers of HERMIS '94

International authorities, well-known Academicians and Professors have

been invited to talk on the most recent advances on subjects that are included

in the Conference programme. The following distinguished scientists have

accepted to talk on related subjects of their speciality:

Professor G.H. GOLUB, Member of National Academy of Sciences,

Department of Computer Science, Stanford University, USA

Professor A. SAMEH, Department of Computer Science, University of Minnesota

and Center for supercomputing R&D, University of Illinois, USA

Professor L.M. DELVES, Department of Statistics and Computational Mathematics

Institute ASC, University of Liverpool, England

Professor G.I. MARCHUK, Academician, President of the CIS Academy of

Sciences, Moscow, CIS

Professor M. GROSS, Laboratoire d'Automatique Documentaire et Linguistique,

University of Paris VII, Paris, France

Professor V.I. AGOSHKOV, CIS Academy of Sciences, Moscow, CIS

Professor Dr. H. USZKOREIT, German Research Center for Artificial Intelligence

Saarbrucken, Germany

Call for Papers

Those who are interested in participating with oral presentation in the

HERMIS '94 Conference are invited to submit three copies of an extended

abstract not over 3 typed pages (A4 with 1 1/2 spacing) including figures. The

abstract may include the basic ideas, methodologies and the results of the

work that is going to be presented. Emphasis will be given to papers that are

relevant to Computer Mathematics and its Applications, especially in the

following areas: Computational Mathematics, Operational Research and

Statistics, Mathematics in Economic Sciences. Papers in the areas of

Data-Bases, Applications of AI to systems and computation, Expert Systems in

Numerical Computing, Computer Networks are also to be considered.

The HERMIS '94 Congress will include several related topics that will

make the Conference of interest to a wide audience of Mathematicians, Computer

Scientists, Economists and many others who wish to become acquainted with the

underlying ideas, concepts and potential applications of the scientific

subjects. The papers presented at the Conference will be published, subject to

refereeing, in the Proceedings of the HERMIS '94 Conference by HMS. The

current plan is to publish post-conference Transactions. Details about the

more formal Transactions, to be published at a later date, may be obtained

from the chairman of the conference Prof. E.A. Lipitakis, Department of

Informatics, Athens University of Economics & Business, 76 Patision str.,

Athens 104 34, Hellas (Fax: +01-82 39 4 39).

Important Dates

Submission of Abstracts: March 21, 1994

Notification of acceptance: April 22, 1994

Camera-ready Manuscripts: June 30, 1994

The submitted abstracts and manuscripts should be sent to the HERMIS '94

scientific programme committee:

HERMIS '94 SECRETARIAT

Department of Informatics

Athens University of Economics and Business

76 Patision Street

Athens 104 34, HELLAS

FAX No: (01) 82 62 204 / (01) 36 41 025

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

From: Jean Roberts <Jean.Roberts@inria.fr>

Date: Thu, 17 Feb 94 15:46:54 +0100

**Subject: 3rd INRIA-SIAM Wave Propagation Conference**

Call for Papers

THIRD INTERNATIONAL CONFERENCE ON

MATHEMATICAL AND NUMERICAL ASPECTS OF

WAVE PROGPAGATION

Sponsored by: INRIA and SIAM

Dates: APRIL 24-28,1995

Location: JUAN-LES-PINS (FRANCE)

The third in the series of INRIA - SIAM Conferences on Mathematical and

Numerical Aspects of Wave Propagation will be held in Juan-les-Pins, France

in April 1995. As in the previous meetings, (in Strasbourg, 1991, and

Delaware, 1993), the major objective is to bring mathematicians and engineers

up to date on new developments, in various domains, concerning methods for

solving mathematical and numerical problems issuing from wave propagation

phenomena. Original work, both mathematical and numerical, is solicited from

mathematicians, scientists, and engineers.

Topics:

o Waves in homogeneous, heterogeneous, layered or random media, homogeneization

o Guided waves, surface waves, scattering, resonances

o Inverse problems and imaging, control theory, optimal control

o High and low frequency asymptotic analysis, ray methods, paraxial methods

o Absorbing boundary conditions, artificial boundary coditions

o Finite difference methods, finite element methods, spectral methods

o Integral equations, boundary element methods

o Multigrid methods, domain decomposition, wavelets

o Vector and parallel processing

o Waves and kinetic equations

o Linear algebra and fast algorithms

Domains of Application:

o Acoustics -o Elastodynamics -o Electromagnetics -o Water waves and

hydrodynamics -o Linear and nonlinear optics -o Geophysics -o Fluid-

structure interaction -o Nondestructive testing -o Tomography

Invited Speakers (having already accepted):

o Patrick Gerard (Ecole Normale Superieure, Paris, France)

o Alexander Kometch (Moscow State University, Russia)

o Donald J. Koury (University of Houston, U.S.A.)

o Peter Markowich (Technical University of Berlin, Germany)

o Paul A. Martin (University of Manchester, England, U.K.)

o David W. McLaughlin (Princeton University, U.S.A.)

o Christian Pichot (CNRS - University of Nice, France)

o John Sylvester (University of Washington, U.S.A.)

Deadline for submissions of FULL PAPERS (10-page maximum) or abstracts of

poster or video contributions: May 20, 1994

For More Information (including instructions for authors) Contact:

Inria-Rocquencourt, Bureau des Cours-Colloques, B.P. 105,

78153 Le Chesnay Cedex, France

tel: 33 (1) 39 63 56 00 fax: 33 (1) 39 63 56 38

e-mail: symposia@inria.fr

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

From: Bruce Hendrickson <bahendr@cs.sandia.gov>

Date: Mon, 14 Feb 94 13:21:23 MST

**Subject: Position at Sandia Labs**

OPENING FOR SENIOR RESEARCHER AT SANDIA LABS

Sandia National Laboratories is seeking an outstanding senior

researcher to fill a leadership staff position in scientific

computation. Preference will be given to candidates in the areas of

high performance computation, applied mathematics, numerical analysis,

or computational biology but other specialties will be considered as

well. The successful candidate will be expected to maintain an active

research program, collaborate with junior staff and computational

scientists, and assist in recruiting and developing future research

directions.

Sandia provides an excellent environment for interdisciplinary

research in applied mathematics and computing. The laboratory

maintains world-class computing facilities, provides a ready

source of interesting research questions and supports a large

research staff with varied backgrounds and interests.

Applicants must hold U.S. citizenship, have earned a Ph.D. degree or

the equivalent, have a strong research record in applied mathematics

or related area and have experience directing young researchers.

Applications should be directed to Richard C. Allen, Mail Stop 1110,

Sandia National Laboratories, P.O. Box 5800, Albuquerque, NM

87185-1110 and should include a resume, a copy of three research

papers, and the names of three references. Further inquiries can be

made by phoning Ernie Brickell at (505)-845-7655 or by sending email to

efbrick@cs.sandia.gov. Resumes sent by email to rcallen@cs.sandia.gov

in LaTeX or ASCII are acceptable.

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

From: Rik Littlefield <rj_littlefield@pnlg.pnl.gov>

Date: Mon, 14 Feb 94 11:46:50 PST

**Subject: Position at Pacific Northwest Laboratory**

I am looking for prospective candidates to fill a postdoctoral position

at DOE's Pacific Northwest Laboratory, Analytic Sciences Department.

If you are aware of any student who might be interested and qualified,

please let both of us know. Feel free to forward this message to your

colleagues.

The successful candidate will investigate and implement parallel

numerical methods for elliptic and parabolic equations. The target

applications are for computational fluid dynamics on MIMD scalable

parallel platforms. This project is interdisciplinary in nature and

interfaces with efforts in numerical analysis, parallel computing,

and large-scale simulation of physical processes. Project members

have access to state-of-the art computing facilities, including

Intel Paragon, IBM SP-1, and KSR. Nominal requirements include a

Ph.D. in computer science, applied mathematics, or an applied

science or engineering discipline. A good algorithms background and

hands-on experience in some aspect of parallel scientific computing

is required.

The appointment is initially for a one-year term, and may be

renewed for a second year.

Applications may sent to Rik Littlefield, Pacific Northwest

Laboratory MS K1-87, P.O.Box 999, Richland, WA 99352, or via

e-mail to rj_littlefield@pnl.gov. The application must include a

resume and the names and addresses of three references.

For further information, contact Rik Littlefield,

rj_littlefield@pnl.gov, phone 509-375-3927, fax 509-375-6631.

Battelle is an affirmative action/equal opportunity employer.

Legal right to work in U.S. is required -- U.S. citizenship

preferred. Pacific Northwest Laboratory is a U.S. Department of

Energy (DOE) laboratory.

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

From: Jean-Baptiste Hiriart-Urruty <jbhu@cict.fr>

Date: Wed, 16 Feb 1994 10:38:28 +0100 (MET)

**Subject: Position at University Paul Sabatier, Toulouse**

Very likely a position of Maitre de Conferences (= assistant professor) will be

opened in OPTIMIZATION (in the broad sense of the word) at the University

Paul Sabatier in Toulouse, France, next October. The official annoncement

will be made by the end of April, and the selection and interviews will take

place in June. Potential applicants can send, from now on, c.v. to

J.-B. Hiriart-Urruty, Department of Mathematics, Universite Paul Sabatier,

118, route de Narbonne, 31062 Toulouse cedex, France.

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

From: Richard S. Falk <falk@numpde.rutgers.edu

Date: Wed, 16 Feb 94 11:31:18 EST

**Subject: Postdoctoral Position at Rutgers University**

We seek a postdoctoral researcher to join an interdisciplinary

research team working on the application of electrical impedance tomography

to detect and quantify corrosion damage in aircrafts. Qualifications

include a solid background in partial differential equations, computational

methods and modeling of physical phenomena. Some material science experience

would be desirable. The appointment will be for 2 years, the start date

is negotiable. Salary may possibly be supplemented through teaching duties.

The appointee, whose research will be supervised by Michael Vogelius and

Fadil Santosa, will be in residence at Rutgers University. He/she is

expected to collaborate with mathematicians and material scientists at

the University of Delaware and Rutgers.

Interested parties should send letter of application and CV to:

Postdoc Hiring Committee

c/o Ms. Pam Irwin

Department of Mathematical Sciences

University of Delaware

110 Rees Hall

Newark, DE 19716

The search will be open until the position is filled.

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

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

Date: Thu, 17 Feb 94 10:36:58 PST

**Subject: Clipper Petition **

Sender: Dave Banisar <banisar@washofc.cpsr.org>

Electronic Petition to Oppose Clipper

Please Distribute Widely

On January 24, many of the nation's leading experts in cryptography

and computer security wrote President Clinton and asked him to

withdraw the Clipper proposal.

The public response to the letter has been extremely favorable,

including coverage in the New York Times and numerous computer and

security trade magazines.

Many people have expressed interest in adding their names to the

letter. In response to these requests, CPSR [Computer

Professionals for Social Responsibility] is organizing an

Internet petition drive to oppose the Clipper proposal. We will

deliver the signed petition to the White House, complete with the

names of all the people who oppose Clipper.

To sign on to the letter, send a message to:

Clipper.petition@cpsr.org

with the message "I oppose Clipper" (no quotes)

You will receive a return message confirming your vote.

Please distribute this announcement so that others may also express

their opposition to the Clipper proposal.

CPSR is a membership-based public interest organization. For

membership information, please email cpsr@cpsr.org. For more

information about Clipper, please consult the CPSR Internet Library -

FTP/WAIS/Gopher CPSR.ORG /cpsr/privacy/crypto/clipper

=====================================================================

The President

The White House

Washington, DC 20500

Dear Mr. President:

We are writing to you regarding the "Clipper" escrowed encryption

proposal now under consideration by the White House. We wish to

express our concern about this plan and similar technical standards

that may be proposed for the nation's communications infrastructure.

The current proposal was developed in secret by federal agencies

primarily concerned about electronic surveillance, not privacy

protection. Critical aspects of the plan remain classified and thus

beyond public review.

The private sector and the public have expressed nearly unanimous

opposition to Clipper. In the formal request for comments conducted

by the Department of Commerce last year, less than a handful of

respondents supported the plan. Several hundred opposed it.

If the plan goes forward, commercial firms that hope to develop

new products will face extensive government obstacles. Cryptographers

who wish to develop new privacy enhancing technologies will be

discouraged. Citizens who anticipate that the progress of technology

will enhance personal privacy will find their expectations

unfulfilled.

Some have proposed that Clipper be adopted on a voluntary basis

and suggest that other technical approaches will remain viable. The

government, however, exerts enormous influence in the marketplace, and

the likelihood that competing standards would survive is small. Few

in the user community believe that the proposal would be truly

voluntary.

The Clipper proposal should not be adopted. We believe that if

this proposal and the associated standards go forward, even on a

voluntary basis, privacy protection will be diminished, innovation

will be slowed, government accountability will be lessened, and the

openness necessary to ensure the successful development of the

nation's communications infrastructure will be threatened.

We respectfully ask the White House to withdraw the Clipper

proposal.

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

From: Daniel Baltzer <publish@baltzer.nl>

Date: Wed, 16 Feb 1994 09:33:35 +0100

**Subject: Contents, Advances in Computational Mathematics**

Contents:

Advances in Computational Mathematics, Volume 2, No.2, 1994, ISSN 1019 7168

Editors-in-Chief: John C. Mason & Charles A. Micchelli

pp 155-184: Numerical solution of eigenvalue problems for Hamiltonian systems

M. Marletta

pp 185-214: Continuous two-scale equations and dyadic wavelets

C.K. Chui and X. Shi

pp 215-222: Some remarks on completely vectorizing point Gauss-Seidel while

using the natural ordering

C.C. Douglas

pp 223-234: A lacunary interpolation algorithm on arbitrary points

E. Venturino

pp 235-250: Wachspress type rational complex planar splines of degree (3,1)

H.P. Dikshit, A. Ojha and R.A. Zalik

Software note

pp 251: RTable-based teste for Bessel function software

A.J. Macleod

Submissions of articles and proposals for special issues are to be

addressed to the Editors-in-Chief:

John C. Mason

Applied & Computational Mathematics Group Royal Military College of Science

(Cranfield University) Shrivenham, Swindon, SN6 8LA, England

E-mail: mason@rmcs.cran.ac.uk

or

Charles A. Micchelli

Mathematical Sciences Department

IBM Research Center

P.O. Box 218, Yorktown Heights, NY 10598, USA E-mail: cam@yktvmz.bitnet

Requests for FREE SPECIMEN copies and orders for Advances in Computational

Mathematics are to be sent to: E-mail: publish@baltzer.nl

.

J.C. Baltzer AG, Science Publishers

Asterweg 1A

1031 HL Amsterdam

The Netherlands

tel. +31-20-637 0061

fax. +31-20-632 3651

e-mail: publish@baltzer.nl

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

From: Daniel Baltzer <publish@baltzer.nl>

Date: Wed, 16 Feb 1994 10:41:12 +0100

**Subject: Contents, Numerical Algorithms**

Contents:

Numerical Algorithms, Volume 6, No. 1-2, 1994, ISSN 1017 1398

Editor-in-Chief: Claude Brezinski

pp 1-35: REGULARIZATION TOOLS: A Matlab package for analysis and solution

of discrete ill-posed problems

P.C. Hansen

pp 37-62: The semilocal convergence of a generalization of Brent's and

Brown's methods

Z. Huang

pp 63-88: Approximating the zeros of analytic functions by the exclusion

algorithm

J.-C. Yakoubsohn

pp 89-101: Circulant preconditioners for Toeplitz-block matrices

T.F. Chan & J.A. Olkin

pp 103-117: Norm estimates for the l2 - inverses of multivariate Toeplitz

matrices

B.J.C. Baxter & C.A. Micchelli

pp 119-135: Well-defined determinant representations for non-normal

multivariate rational interpolants

H. Allouche & A. Cuyt

pp 137-168: Singular values for a multivariate quotient-difference algorithm

H. Allouche & A. Cuyt

pp 169-200: Algorithms for ordering unorganized points along parametrized curves

J.-P. Dedieu and Ch. Favardin

pp 201- 203: Book reviews

Submissions of articles and proposals for special issues are to be

addressed to the Editor-in-Chief:

Claude Brezinski

Laboratoire d'Analyse Numerique et d'Optimisation

UFR IEEA - M3

Universite des Sciences et Technologies de Lille

59655 Villeneuve d'Ascq Cedex

France

E-mail: brezinsk@omega.univ-lille1.fr

postal address:

Paris Drouot BP 18

75433 Paris Cedex 09

France

Requests for FREE SPECIMEN copies and orders for Numerical Algorithms are

to be sent to: E-mail: publish@baltzer.nl

.

J.C. Baltzer AG, Science Publishers

Asterweg 1A

1031 HL Amsterdam

The Netherlands

tel. +31-20-637 0061

fax. +31-20-632 3651

e-mail: publish@baltzer.nl

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

End of NA Digest

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