## NA Digest Sunday, January 19, 1992 Volume 92 : Issue 3

### Today's Editor:

Cleve Moler
The MathWorks, Inc.
moler@mathworks.com

### Submissions for NA Digest:

Mail to na.digest@na-net.ornl.gov.

### Information about NA-NET:

Mail to na.help@na-net.ornl.gov.

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

From: Jill Mesirov <jill@Think.COM>
Date: Mon, 13 Jan 92 10:21:38 EST
Subject: CRA Database on Female Computer Scientists

The Computing Research Association (CRA) Committee on the Status of Women
is compiling a database of female computer scientists. In this initial
stage of the database project, we wish to keep its size manageable. For
this reason, we are restricting attention to PhD-level computer scientists.
The scope of the database may be expanded later.

To be eligible for inclusion in the database, a woman must fall into
one of the following three categories:

(1) Has a PhD in computer science or computer engineering
(2) Has a PhD in a related field (such as mathematics or
electrical engineering), holds a full-time research and/or
teaching position, and identifies her primary area of interest
as computer science or computer engineering
(3) Is a graduate student currently enrolled in a PhD program in
computer science or computer engineering

If you fall into one of these categories, please complete the enclosed
questionaire and send it, preferably by electronic mail, to:

Joan Feigenbaum
AT&T Bell Laboratories
Room 2C-473
600 Mountain Avenue
P. O. Box 636
Murray Hill, NJ 07974-0636
jf@research.att.com

The CRA will maintain a complete database at its offices in Washington.
In addition, our committee will put together a more concise, public
version of the database and distribute it widely, either in book form
or on floppy disks or both. You have the option of marking any of your
answers to the following questions PRIVATE. If you say that you want
an answer to remain private, it will be stored only in the central database
at the CRA offices and used only for statistical purposes. If you do not
mark an answer PRIVATE, it may be included in your record in the publicly
distributed form of the database.

The last question of the questionaire asks you to indicate for which purposes
your answers may be used. Broadly speaking, we foresee two general categories
of uses for the database: statistical (e.g., people doing studies of women in
computing or women in science in general may use the central database for
large scale searches) and recruiting (e.g., organizations that want to hire
someone, program chairs who want to find committee members, awards committees,
etc. may look for plausible candidates in either the central or the public
version of the database). Your record in the database will not be given to
people who plan to use it for a purpose that you have not approved. However,
we think that it is very important to realize that there are undoubtedly many
legitimate and interesting uses of these data that we are unaware of at this
point and that we probably won't become aware of until the data are collected.
For this reason, we hope that you'll answer the last question by saying that
you grant permission to use your record in the database to all users
approved by the committee.''

Finally, you may wonder why the second question of the questionaire
asks for gender'' when all of the people in the database will be women.
We have included this question because the scope of our database project
may be expanded in the future, and men may be included at some future
stage.

====================== Begin Questionaire ============================

1. Name

2. Gender

3. Birthdate

4. Citizenship

5. Affiliation

If university or college, is it PhD-granting?

If your department has more than one division'' (e.g., it is a CS/EE
department with a CS division and an EE division), what are the names of
the division, and which one are you in?

6. Title

If PhD student, what is your expected graduation date?

9. Phone number

10. FAX number

11. PhD

Year
School
Department
If the department had more than one division,'' what were the names of
the divisions, and which one were you in?

12. Bachelors degree

Year
School
Department
If the department had more than one division,'' what were the names of
the divisions, and which one were you in?

13. Technical area: Select one or two of the following
(A) Architecture
(B) Artificial intelligence
(C) Computer-aided design
(D) Databases
(E) Distributed computing
(F) Graphics and modelling
(G) Hardware
(H) Networks and communications
(I) Numerical analysis
(J) Parallel computing
(K) Programming languages
(L) Robotics or vision
(M) Software engineering
(N) Software systems
(O) Theory of computation
(P) Other -- please specify

In addition, for each of the areas that you selected, you may supply
up to three subareas'' of your own description.

14. Publications: Supply complete references for up to five
representative publications. AVOID ACRONYMS AND ABBREVIATIONS.

15. Are you willing to have your name listed in our speakers database?
If so, please indicate which of the following types of audiences
you are willing to address. Supply up to three representative talk
titles; for each title, include the letter(s) of the appropriate
audience type(s) and a one-or-two-sentence abstract.

(A) Kindergarten through 6th grade
(B) 7th - 9th grades
(C) 10th - 12th grades
(E) Computer scientists, general
(F) Computer scientists, specializing in my field
(G) General scientific audiences
(H) Business audiences (indicate specific type, e.g., marketing,''
management'', if desired)
(I) Other -- please specify

16. Are you a member of one of the following groups?

(A) African American
(B) Female Asian Pacific Islander
(C) Hispanic
(D) Native American
(E) Other -- please specify
(F) Prefer not to identify

17. The database may be used by the following categories of people and
organizations. Check each one to which you grant access to your record.
If you are willing to grant access to all users approved by the committee,
then simply check category (F). The answers that you have marked PRIVATE
may only be accessed by users in category (E), even if you grant general

(A) Employment search committees
(B) Conference organizers, program chairs, journal editors-in-chief, and
(C) Awards committees
(D) Service committees (such as ours)
(E) Scholars and committees studying women in computing
(F) All users approved by the committee

-- Thanks,
Jill Mesirov

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

From: Uli Scharffenberger <SCHARFFE%DHDIBM1.bitnet@CUNYVM.CUNY.EDU>
Date: Thu, 16 Jan 92 14:24:21 CET
Subject: Good Random Numbers, Response to Jeffrey Dunn

I can offer some information on RNGs for independent, uniformly
distributed RNs on (0,1).

Important issues in generating such RNs are:

- Uniformity
- Independence (small correlations)
- Long periods (10 to 100 or more)
- Splitting facilities (the possibility to generate statistically
independent streams on parallel processors)

Not all issues are equally important for every application, and the
quality of an RNG has to be evaluated with respect to a particular
application.

Good literature (in my subjective view) is:

General:

S.L. Anderson: RNGs on Vector Supercomputers and other advanced architectures
SIAM Review Vol.32, June 1990

F. James: A Review of RNGs, Computer Physics Communication 1990 or 1991
(I do not know the exact issue). Code can be obtained from
CERN.

G. Marsaglia: A Current View of RNGs, in "Computer Science and Statistics:
the interface", L. Billard(ed.), Elsevier Science Publishers
1985. Is particularly important for testing RNGs.

Multiplicative Congruential RNGs with modulus (2 to 31 - 1):

G.S. Fishman, L.R. Moore: An Exhaustive Analysis of Multiplicative
Congruential RNGs with Modulus (2 to 31 - 1).
SIAM Journ. Sci. Stat. Comp. Vol 7, 1986

It has become quite fashionable to combine two RNGs to obtain better ones.
On this subject the bible is:

P. L'Ecuyer: Efficient and Portable Combined RNGs, Comm. of the ACM,
Vol 31, 1988.

P. L'Ecuyer, S. Cote: Implementing a Random Number Package with Splitting
Facilities, ACM Transact. on Math. Software, Vol. 17, 1991

I also have two interesting preprints of which I do not know where they will
appear:

S. Tezuka, P. L'Ecuyer: Efficient and Portable Combined Tausworthe RNGs
(Tezuka is from IBM Research, Tokyo; L'Ecuyer's
address can be found in the quoted papers)

S. Fillipone, P. Santangelo, M. Vitaletti: A Vectorized Long Period
Shift-Register RNG, IBM European Center for
Scient. and Engin. Comp., Via Giorgione 159,
I-00147 Rome, Italy.
This generator can be easily implemented on any
vector computer.

I apologize in advance for all those excellent contributions with I did
not mention since I do not know them.

Hope it helps,

Uli Scharffenberger (SCHARFFE at DHDIBM1.BITNET)
alt.: na.scharffenberger at na-net.ornl.gov.

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

From: Jim Kirkpatrick <JIMKIRK@corral.uwyo.edu>
Date: Thu, 16 Jan 1992 20:44 MST
Subject: Re: Good Random Number Generators

Jeffrey Dunn asks about good random number generators. A very good
survey article on this topic is:
Random Number Gnerators: Good Ones are Hard to Find
Stephen K. Park and Keith W. Miller
CACM, V31 #10 (October 1988)

Of course there have been a few advances in the years since that was
published. See for example:
A New Class of Random Number Generators
George Marsaglia and Arif Zaman
Annals of Applied Probability, 1991, V 1 #3 page 462-480

I think the Park/Miller article would be an excellent starting point.

Jim Kirkpatrick jimkirk@corral.uwyo.edu

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

From: Herman J. Woltring <UGDIST@NICI.KUN.NL>
Date: Thu, 16 Jan 92 00:57 MET
Subject: 3-D Attitude "Vectors"

Last year, I submitted a manuscript "3-D Attitude Parametrization: a Stan-
dardization Proposal" for publication in a major journal in the Biomechanics
field, in view of current discussions on how to standardize 3-D attitude and
rotation descriptions for body segments and joints. At present, Cardan/Euler
angles are advocated by many as being useful -- despite a number of drawbacks
described in the manuscript. Interested na-netters may retrieve the LaTeX
manuscript from LISTSERV@HEARN.BITNET or from LISTSERV@NIC.SURFNET.NL on the
Internet, by sending the one-line request SEND ATTJOB TEX (Subj.: line is
irrelevant) in the body of an email note.

In the manuscript, I propose to use the rotation "vector" THETA = theta N,
where N is the unit length eigenvector (with real eigenvalue) of a 3*3, pure
rotation matrix, and where theta is the angle needed to rotate an object
about N from the reference attitude (I) to the actual one (R), according to
the right-handed rule. There is very little literature on this compact and
non-singular attitude descriptor: Craig (1986) as quoted in the manuscript,
and yesterday I came across the following reference:

Alain Li'egeois (1985), Performance and Computer-Aided Design (Series Robot
Technology, Vol. 7), Hermes Publishing, London-Paris-Lausanne [translated
from the original 1984 french edition]

which describes it on the basis of a French research report "A Programming
Language for Robotics (LM)" from the Laboratoire de Mathe'matiques Appliqu'ees
et Informatique in Grenoble by J.-C. Latombe & J. Mazer (RR 197, March 1980).

I have unconfirmed information that the rotation "vector" was already described
one century ago by Paul Volkmann in Germany, and I would be grateful for any
comments from the na-net readership on the history of this rotation/attitude
descriptor.

Thanks in advance -- Herman J. Woltring, Eindhoven, The Netherlands
Moderator, Biomch-L@nic.surfnet.nl
<na.woltring@na-net.ornl.gov>

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

From: Dan Sorensen <danny@rice.edu>
Date: Thu, 16 Jan 1992 14:11:42 -0400
Subject: Graduate Computational S & E Degree at Rice University

Rice University has recently established a new graduate degree
program in Computational Science and Engineering. We are soliciting
applications for the Fall '92 semester. Please pass this information
along to any students who might be interested. Unfortunately, there
is not much time remaining for students to send in applications.
Interested students should contact us within the next month to
be considered.

Thanks
Dan Sorensen

ANNOUNCING A NEW DEGREE PROGRAM
in
COMPUTATIONAL SCIENCE and ENGINEERING
at
RICE UNIVERSITY

As a consequence of the rapid increase in computing power over the past
decade, modern science and engineering disciplines have become increasingly
reliant upon computation as an aid to research, development, and design.
This new degree program has been designed to provide education in using the
newest and most powerful computers and computational techniques. Topics of
study include parallel-vector processing, scientific visualization,
networking, compiler technology, programming environments, parallel
algorithms, numerical methods, and modeling with an emphasis on application
(e.g. computational biology/physics/chemistry, etc).

The degree program will consist of two degree tracks: one will lead to a
Ph.D. and the other to a Professional Masters Degree. The Masters Degree
does not require a thesis.

Interested applicants are encouraged to write to:

Rice University
CITI - Computational Science and Engineering Degree Program
P.O. Box 1892
Houston, TX 77251

or send e-mail to: tlc@rice.edu (Ms. Theresa Chatman) 713-527-6077

Applicants to the Computational Science and Engineering program must
fulfill the admission requirements and be admitted to one of the
participating departments. Currently the participating departments are
Mathematical Sciences, Computer Science, Chemical Engineering, and
Electrical Engineering.

First year Graduate fellowships are provided by the Center for Research on
Parallel Computation (an NSF Science and Technology Center) for students
accepted to the Ph.D. program. Subsequent funding will be provided through
participation in sponsored research activities.

The official deadline for application is 1 Feb 92. However, applications
received within two weeks from that date will receive full consideration.

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

From: Brent Lindquist <lindquis@ams.sunysb.edu>
Date: Sat, 18 Jan 92 17:32:24 EST
Subject: Postdoc at SUNY, Stony Brook

POSTDOCTORAL POSITIONS AVAILABLE
at SUNY-STONY BROOK

One or more postdoctoral positions may be available for
work in computational fluid dynamics and hyperbolic conser-
vation laws. Diverse applications including environmental
remediation, oil reservoir modeling, gas dynamics and fluid
instabilities are being studied using parallel computing,
front tracking, grid refinement and related methods.

To apply for these positions please send a vita, resume
and a statement of scientific interests to James Glimm at

The Department of Applied Mathematics and Statistics
SUNY at Stony Brook,
Stony Brook, NY 11794-3600.

Applicants should also list three references, who have
been requested to send letters of recommendation to the

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

From: Paul Concus <concus@csr.lbl.gov>
Date: Sun, 19 Jan 92 06:33:03 PST
Subject: Postdoc Position at Lawrence Berkeley Lab

POSTDOCTORAL FELLOWSHIP AT LAWRENCE BERKELEY LABORATORY

A position is available for a postdoctoral research fellow in
computational and applied mathematics at the University of California
Lawrence Berkeley Laboratory. The fellow would work in a group whose
interests include, but are not limited to, computational fluid
mechanics, turbulence theory, many-body systems, percolation theory,
Monte-Carlo methods, grid generation, combustion, interface problems,
and parallel computing. The position is for one year, beginning in the
summer or fall of 1992, with possibility of renewal for a second year.
Support is provided primarily by special funds from the Department of
Energy Applied Mathematical Sciences Research Subprogram, for which
there is a stipulation that the recipient be a U.S. citizen or
permanent resident. Interested persons should send a curriculum vitae
and the names of three references before March 15, 1992 to Prof.
Alexandre Chorin, 90-1042 (A6561), Lawrence Berkeley Laboratory,
University of California, Berkeley, CA 94720. Affirmative
Action/Equal Opportunity Employer.

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

From: Karen Hahn <khahn@cs.rutgers.edu>
Date: Wed, 15 Jan 92 18:26:01 EST
Subject: IMACS Conference on Computer Methods for PDE's

SECOND CALL FOR PAPERS

7TH. IMACS INTERNATIONAL CONFERENCE ON COMPUTER METHODS FOR
PARTIAL DIFFERENTIAL EQUATIONS
(formerly known as the Lehigh Conferences)
June 22-24, 1992, Rutgers University, New Brunswick, NJ 08903, USA

Manuscripts are solicited on all aspects of the numerical solution of
partial differential equations. While special emphasis will be placed
on those aspects that are related to applications of new computing
architectures and to questions that are related to computational wave
propagation in fluid dynamics, contributions to other areas will be
equally considered.

Manuscripts received no later than April 15 and accepted for
presentation will be listed in the final program announcement.
Submissions received after that date will be considered if space in
the program remains available. All papers presented at the Conference
will be included in a Book of Proceedings that will be published.

The program will consist of "Organized Sessions" and "Contributed
Papers Sessions". The list of organized sessions and of their
organizers follows:

ORGANIZED SESSIONS AND THEIR ORGANIZERS

J.R. Rice (Purdue) Parallel Methods for PDEs.
W.F.Ames (Ga. Tech.) Splitting Methods for PDEs.
M. Mu (Purdue)Performance of Parallel Sparse Matrix Algorithms.
J.G. Verwer (CWI- Amsterdam) Adaptive Grid Methods for Time-Dependent PDEs.
M.J. Fritts (SAIC) and D. Knight (Rutgers) Fluid Dynamics Calculations
on Unstructured Meshes.
M.J. Fritts (SAIC) and D. Knight (Rutgers) Gridding Accuracy
Estimation and Adaption for the Navier-Stokes Equations.
J.E. Flaherty (RPI) Adaptive Methods for Time-Dependent PDEs.
M.J. Buckingham (Scripps Inst.) Computational Ocean Acoustics.
V.A. Dougalis (NTU Athens Greece) Modelling and Computational Methods in Underwater Acoustics.
W.E. Schiesser (Lehigh) and G.D. Byrne (Exxon) Methods of Lines.
S. Steinberg (UNM) Symbolic Computation in the Numerical Solution of PDE's
R.S. Falk (UNM) Finite-Element Methods for PDEs.
G.Vichniac (Kendall Square Res. Corp) Lattice-Gases and PDEs.
R. Vichnevetsky (Rutgers) Discrete Wave Propagation in CFD.
S.K. Dey (Eastern Ill. U.) Recent Algorithms for Nonlinear PDEs.
T.R.Taha (U. of Georgia) Numerical Solution of Nonlinear Schroedinger Equation
K. Jordan (Thinking Mach. Corp.) Solutions of PDEs with Connections Machines.
E.J. Kansa (Lawrence L. Nat. Labs) A. Law (U. of Regina) Advances in
Grid Free, Scattered Data Radial Basis Function Approximations.
C. Ribbens (Va. Tech.) Future Directions in Mathematical Software for PDEs.
R. Weiss, W. Schoenauer (U. Karlsruhe) Black-Box Solvers and Special
Purpose Programs for the Solution of PDEs on Supercomputers.
R.P. Gilbert (U. of Del) Inverse Problems .
P. Fischer, Nonlinear Galerkin Methods and Parallel Computers.

Send all Correspondence to: Karen Hahn
IMACS PDE7 Conference Secretary
Rutgers University
Dept. of Computer Science
New Brunswick, NJ 08903 USA
FAX: 908 932 5530
e-mail: imacs@cs.rutgers.edu

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

From: Lothar Reichel <reichel@mcs.kent.edu>
Date: Thu, 16 Jan 92 16:13:42 EST
Subject: Conference at Kent State on Linear Algebra and Computing

CONFERENCE ON NUMERICAL LINEAR ALGEBRA AND SCIENTIFIC COMPUTING

The Institute of Computational Mathematics at Kent State University in
conjunction with the Western Pennsylvania / Eastern Ohio secion of SIAM
is sponsoring a conference on Numerical Linear Algebra and Scientific
Computing.

Date: March 13-14, 1992
Place: Kent, OH

A preliminary list of speakers includes:

G.S. Ammar, Northern Illinois University, DeKalb, IL
M. Eiermann, University of Karlsruhe, Karlsruhe, Germany
R.W. Freund, RIACS, Moffett Field, CA
W.B. Gragg, Naval Postgraduate School, Monterey, CA
M.H. Gutknecht, ETH, Zurich, Switzerland
Y. Saad, University of Minnesota, Minneapolis, MN
G.W. Stewart, University of Maryland, College Park, MD
P. Van Dooren, Univerity of Illinois, Urbana, IL

A limited number of contributed presentations are solicited. Please contact
the organizers below regarding contributed papers and accomodation as soon as
possible but no later than March 1. Talks will be scheduled from 9 a.m. on
Friday to 5 p.m. on Saturday. Participants can fly into either Akron/Canton or
Cleveland and should contact the organizers about transportation from airports
to Kent.

Organizing committee:

L. Reichel e-mail: reichel@mcs.kent.edu phone: (216) 672-2547
A. Ruttan e-mail: ruttan@mcs.kent.edu phone: (216) 672-2073
R.S. Varga e-mail: varga@mcs.kent.edu phone: (216) 672-2145

Institute for Computational Mathematics
Kent State University
Kent, OH 44242

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

From: Heinz W. Engl <k310773@EDVZ.UNI-Linz.AC.AT>
Date: Wed, 15 Jan 92 09:45:40 CET
Subject: Contents, Surveys on Mathematics for Industry

SURVEYS ON MATHEMATICS FOR INDUSTRY
(springer verlag vienna-new york)

Obituary Hansjoerg Wacker (1939-1991)

P.Neittaanmaeki, Computer aided optimal structural design
(pp.173-215)
M.Jung, U.Langer, Applications of multilevel methods to practical problems
(pp.217-257)

Prof.Dr.Heinz W. Engl
Institut fuer Mathematik
Johannes-Kepler-Universitaet

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

From: SIAM <helfrich@siam.org>
Date: Mon, 13 Jan 92 09:46:25 EST
Subject: Contents, SIAM Control and Optimization

SIAM Journal on Control and Optimization
Vol. 30, No. 3, May 1992

Controle optimal dans les equations elliptiques
R. Tahraoui

$H\infty$ Controller Synthesis by $J$-Lossless Coprime
Factorization
Michael Green

Rate-Preserving Discretization Strategies for Semi-Infinite
Programming and Optimimal Control
Elijah Polak and Limin He

On Robust PI-Control of Infinite-Dimensional Systems
Martmut Logeman and Hans Zwart

Stochastic Discrete Optimization
Di Yan and H. Mukai

Investment-Consumption Models with Transaction Fees and Markov-
Chain Parameters
Thaleia Zariphopoulou

Estimation of Unknown Variable Parameters in Moving Boundary
Problems
K. A. Murphy

A Linear Programming Approach to the Search Game on a Network
with Mobile Hider
Edward J. Anderson and Miguel Aramendia

Minimal Length Curves that are not Embeddable in an Open Planar
Set: The Problem of a Lost Swimmer with a Compass
R. Hassin and A. Tamir

Finite-Dimensional Approximations of Unstable Infinite-
Dimensional Systems
G. Gu, P. P. Khargonekar, E. B. Lee, and P. Misra

Some Remarks on the Riccati Equation Arising in an Optimal
Control Problem with State- and Control-Dependent Noise
Gianmarco Tessitore

For further information contact Laura B. Helfrich, Managing
Editor, SIAM Journal on Control and Optimization, 3600 University
City Science Center, Philadelphia, PA 19104-2688. Phone: (215)
382-9800. e-mail: helfrich@siam.org

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

From: Richard A. Brualdi <brualdi@imafs.ima.umn.edu>
Date: Thu, 16 Jan 92 12:04:58 CST
Subject: Contents, Linear Algebra and Applications

Contents of Volumes 162-164 of LAA, February 1992

DIRECTIONS IN MATRIX THEORY:

THE FOURTH AUBURN LINEAR ALGEBRA CONFERENCE
MARCH 20-23, 1990

Special Editors: David H. Carlson and Frank Uhlig

Ky Fan (Santa Barbara, California)
Some Aspects of the Development of Linear Algebra in the Last Sixty Years

Robert C. Thompson (Santa Barbara, California)
High, Low, and Quantitative Roads in Linear Algebra

Richard A. Brualdi (Madison, Wisconsin)
The Symbiotic Relationship of Combinatorics and Matrix Theory

P. A. Fuhrmann (Beer Sheva, Israel)
Functional Models in Linear Algebra

Lothar Reichel (Kent, Ohio) and Lloyd N. Trefethen (Ithaca, New York)
Eigenvalues and Pseudo-eigenvalues of Toeplitz Matrices

John Drew, Charles R. Johnson (Williamsburg, Virginia), and
P. van den Driessche (Victoria, British Columbia, Canada)
Strong Forms of Nonsingularity

Thomas J. Laffey (Dublin, Ireland)
A Structure Theorem for Some Matrix Algebras

Chi-Kwong Li (Williamsburg, Virginia) and Nam-Kiu Tsing (College Park, Maryland)
Linear Preserver Problems: A Brief Introduction and Some Special Techniques

Stephen Pierce (San Diego, California)
Linear Maps on Algebraic Groups

E. Anderson (Eagan, Minnesota), Z. Bai (Lexington, Kentucky),
and J. Dongarra (Knoxville, Tennessee)
Generalized QR Factorization and Its Applications

H. Lev-Ari and T. Kailath (Stanford, California)
State-Space Approach to Factorization of Lossless Transfer
Functions and Structured Matrices

Graciano de Oliveira (Macau)
Interlacing Inequalities. Matrix Groups

George Poole and Larry Neal (Johnson City, Tennessee)
Gaussian Elimination: When Is Scaling Beneficial?

D. R. Farenick (Toronto, Ontario, Canada)
Krein-Milman-Type Problems for Compact Matricially Convex Sets

On Tournament Matrices

On The Extremal Points of a Class of Polytopes of Matrices

Eric Kostlan (Honolulu, Hawaii)
On the Spectra of Gaussian Matrices

A. I. Tovbis (Odessa, USSR)
Normal Forms of Holomorphic Matrix-Valued Functions and
Corresponding Forms for Singular Differential Operators

Dennis Bernstein (Ann Arbor, Michigan)
Some Open Problems in Matrix Theory Arising in Linear Systems and Control

S. Galanis, A. Hadjidimos, D. Noutsos, and M. Tzoumas (Ioannina, Greece)
On the Optimum Relaxation Factor Associated With p-Cyclic Matrices

Jean-Claude Evard and Frank Uhlig (Auburn, Alabama)
On the Matrix Equation f(X)=A

A. C. M. Ran (Amsterdam, The Netherlands)
Unitary Solutions of a Class of Algebraic Riccati Equations and Factorization

Charles R. Johnson (Williamsburg, Virginia) and Michael Lundquist (Prova, Utah)
An Inertia Formula for Hermitian Matrices With Sparse Inverses

Julian Laderman, Victor Pan (Bronx, New York),
and Xuan-He Sha (New York, New York)
On Practical Algorithms for Accelerated Matrix Multiplication

LeRoy B. Beasley and Sang-Gu Lee (Logan, Utah)
Linear Operators Strongly Preserving r-Potent Matrices Over Semirings

Charles R. Johnson (Williamsburg, Virginia) and
Erik A. Schreiner (Kalamazoo, Michigan)
Explicit Jordan Form for Certain Block Triangular Matrices. II

Gin-Hor Chan (Singapore) and Ming-Huat Lim (Malaysia)
Linear Preservers on Powers of Matrices

Walter Morris (Fairfax, Virginia)
The Connected Components of the Set of R0-Matrices

Thomas H. Pate (Auburn, Alabama)
Descending Chains of Immanants

Jean H. Bevis and Frank J. Hall (Atlanta, Georgia)
LDLT Factorizations of Adjacency Matrices Where D Is Block Diagonal

Yiu Tung Poon (Ames, Iowa)
The Convexity of a Generalized Matrix Range

Wayne W. Barrett and Tyler J. Jarvis (Provo, Utah)
Spectral Properties of a Matrix of Redheffer

Elena Sanchez, Vicente Hernandez, and Rafael Bru (Valencia, Spain)
Minimal Realizations for Discrete-Time Linear Periodic Systems

Frank Uhlig, Tin-Yau Tam (Auburn, Alabama), and
David Carlson (San Diego, California)
REPORT: Directions in Matrix Theory, Auburn

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

End of NA Digest

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