**Today's Topics:**

- Fourth Parallel Circus
- Factoring Polynomials
- Position in North Carolina
- Riccati Equation Meeting in Italy
- Nineteenth Annual USL Mathematics Conference
- Dundee Biennial NA Conference 1989
- Position in OR at Stanford

From: Apostolos Gerasoulis <gerasoul@aramis.rutgers.edu>

Date: Sun, 18 Sep 88 13:35:45 EDT

FOURTH PARALLEL CIRCUS

RUTGERS University, New Brunswick, New Jersey, December 2-3, 1988

THEME: Parallel Numerical Algorithms, Programming Tools and Applications.

OBJECTIVE: The meeting is an informal gathering of researchers

interested in parallel processing. The intention is to discuss recent

results in the area and exchange ideas for future work. The atmosphere

is completely casual and the speakers are chosen at the beginning of

the circus. To encourage easy discussion, there are no formal

proceedings. We hope that about 50 persons will be in attendance and

there are no parallel sessions.

HISTORY: It has been customary for the circus to be held twice a year

during Friday and Saturday. The first Parallel Circus was held in May

1987 at Yale (Chaired by Prof. M. Schultz), the second at Cornell in

November 1987, (chaired by Prof. Van Loan), and the third at IBM

Kingston (organized by V. Sonnad and chaired by Prof. G. Golub and M.

Schultz).

PLACE: The Fourth Parallel Circus is organized by Rutgers University

and will be held at the Hyatt Regency Hotel at New Brunswick, New

Jersey (chaired by G. Golub and A. Gerasoulis). New Brunswick is

located between New York (35 miles southwest) and Philadelphia and is

easily accessible via plane (Newark airport), train and automobile.

CONTACTS: If you wish to attend please contact Prof. Apostolos

Gerasoulis or Ms. Priscilla Rasmussen as soon as possible. PHONE:

(201)-932-2725/2768, E-MAIL: gerasoulis@aramis.rutgers.edu,

rasmussen@aramis.rutgers.edu, ADDRESS: Department of Computer Science,

Rutgers University, New Brunswick, NJ 08903. If you wish to present

your work at the meeting include the title of your talk in your

message.

DEADLINES: The reservation cut off date for the conference rate at the

Hyatt is 11/10/88.

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

From: Rolf Jeltsch <JELTSCH%DACTH51.BITNET@Forsythe.Stanford.EDU>

Date: Mon, 19 Sep 88 10:51:21 CET

A collegue of mine, Prof. Plesken has asked me whether numerical

analysts know the following algorithm to compute

factors of polynomials. I would like to present this

question to the NA community. If you see resemblence to known

algorithms or even have a reference please let me know or wirte

directly to my collegue: His e-mail address is

FM@DACTH51.BITNET

Here comes the description of the algorithm.

Assumption: x is an indeterminate and f(x)=x~n+a_(n-1)x~(n-1)+...+a_0

in R[x] is a real polynomial.

Aim: Find a factorization f(x) = g(x)h(x).

Framework: R[x]/f(x) denotes the ring of polynomials modulo f(x), whose

elements are represented by the polynomials p(x) of degree less than n.

The relation x~n=-(a_0+...+a_(n-1)x~(n-1)) is used to find this normal

form e(p(x)) for p(x) in R[x] of degree greater or equal to n. Note,

multiplication by x is represented by the companion matrix A of f(x)

with respect to the basis 1,x,...,x~(n-1) of R[x]/f(x) and multiplication

by p(x) by p(A)=:mat(p(x)).

Algorithm:Choose a_0=p(x) in R[x]/f(x) with norm 1(= det(p(A))). Define

a_(i+1):=a_i~2 ( multiplication in R[x]/f(x)). For moderately large n

mat(a_n) will have k>0 eigenvalues close to zero and n-k>0 eigenvalues

very big.(We neglect the case where p(A) has eigenvalues of absolute

value 1.) Let z:=a_n. Test when z,xz,x~2z,... becomes (approximately)

linearly dependent in R[x]/f(x) for the first time and obtain a relation

x~kz=c_0z+c_1xz+...+c_(k-1)x~(k-1)z. Then g(x)=x~k-c_(k-1)x~(k-1)-...-c_0

in R[x] is a polynomial dividing f(x). Varying the degree of accuracy

one might find different k's and divisors g(x) also with varying degree

of accuracy from the same element z.

--Rolf Jeltsch

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

From: UNCJWT%UNC.BITNET@Forsythe.Stanford.EDU

Date: Mon, 19 Sep 88 16:40 EST

UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL

DEPARTMENT OF MATHEMATICS

The Department of Mathematics at the University of North Carolina

invites applications for a senior level tenured appointment in the

general area of applied and/or computational mathematics. Rank and

salary depend on qualifications; demonstrated excellence in research

and teaching are required. Applications will be accepted until the

position is filled; however, applications received by January 15,1989

are assured of full consideration. Inquiries should be directed to:

Search Committee, % Pat Levin, Mathematics Department, CB# 3250,

UNC at Chapel Hill, Chapel Hill, NC 27599. EO/AA employer. Women

and minorities are encouraged to apply.

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

From: Alan J. Laub <laub%lanczos@hub.ucsb.edu>

Date: Wed, 21 Sep 88 14:42:13 PDT

THE

RICCATI EQUATION

IN

CONTROL, SIGNALS, AND SYSTEMS

VILLA GALLIA, COMO (ITALY) -- JUNE 26-29, 1989

A WORKSHOP

sponsored by

C.N.R. -- Consiglio Nazionale delle Ricerche

co-sponsored by

I.F.A.C. -- International Federation of Automatic Control

S.I.A.M. -- Society for Industrial and Applied Mathematics

with the participation of the

I.E.E.E. Control Systems Society

*****

Politecnico di Milano

Dipartimento di Elettronica

and

Centro di Teoria dei Sistemi C.N.R.

PURPOSE OF THE MEETING:

To present a coherent picture of the main results achieved in the

last 30 years on the Riccati Equation. Theory, applications, and

numerical algorithms will be considered with emphasis on its

relevance to optimal control and filtering, Linear-Quadratic-

Gaussian problems, H-infinity optimization, network synthesis,

etc. There will be an opening lecture by R.E. Kalman -- Swiss

Federal Institute of Technology, Zurich, Switzerland and Univer-

sity of Florida, USA, three tutorial lectures (by A.J. Laub --

University of California, Santa Barbara, USA, M.A. Shayman --

University of Maryland, USA, and J.C. Willems -- University of

Groningen, The Netherlands), invited lectures, and contributed

papers.

The language of the meeting is English.

PROGRAM COMMITTEE:

S. Bittanti -- Politecnico di Milano, Italy

A.J. Laub -- University of California, Santa Barbara, U.S.A.

J.C. Willems -- Groningen University, The Netherlands

H.H. Wimmer -- Universitat Wurzburg, West Germany

INVITED SPEAKERS:

R.R. Bitmead -- Australian National University, Australia

S. Bittanti -- Politecnico di Milano, Italy

R.S. Bucy -- University of Southern California, USA

R. Byers -- University of Kansas, USA

A. Bunse-Gerstner -- Universitat Bielefeld, West Germany

M. Gevers -- Universite Catholique Louvain, Belgium

K. Glover -- Cambridge University, UK

D. Hinrichsen -- Universitat Bremen, West Germany

T. Kailath -- Stanford University, USA

V. Kucera -- Czechoslovak Academy of Science, Czechoslovakia

V. Mehrmann -- Universitat Bielefeld, West Germany

J.B. Moore -- Australian National University, Australia

T. Nishimura -- Institute of Space and Astronautical Science, Japan

L. Rodman -- College of William and Mary, USA

L.M. Silverman -- University of Southern California, USA

J.L. Speyer -- University of Texas at Austin, USA

H.L. Trentelman -- Technische Universiteit Eindhoven, The Netherlands

J.L. Willems -- University of Ghent, Belgium

H.H. Wimmer -- Universitat Wurzburg, West Germany

CONTRIBUTED PAPERS:

There is time allotted for high quality contributed papers. Only

papers with original results will be accepted. Prospective au-

thors are invited to submit 5 copies of an extended summary or

draft manuscript in English to the Chairman at the following ad-

dress:

Professor S. Bittanti

Dipartimento di Elettronica

Politecnico di Milano

Piazza Leonardo da Vinci 32

20133 Milano

ITALY

Telefax 2.23993587 Telex 333467 POLIMI-I

The length of the draft should be approximately 5 double-spaced

pages. Authors should also provide a title page, with a 350-word

abstract, 5 keywords, full address, telephone or telefax number,

and e-mail address if available.

DEADLINES:

November 30, 1988 5 copies of a 5 page extended summary or draft

plus a title page to be mailed to the chairman

February 28, 1989 Acceptance notification for contributed drafts

April 30, 1989 Full manuscript due

WORKSHOP LOCATION:

The meeting will be held at Villa Gallia, an 18th Century villa

located on the shore of Lake Como in Como, Italy. The historic

town of Como is easily reachable from Milan either by car (motor-

way A9) or train. Frequent trains start from Stazione Ferrovie

Nord in Milan, but there are trains from the Stazione Centrale or

Stazione Porta Garibaldi as well. Alternatively, Como can be

reached from the Zurich airport by train or by car.

ORGANIZING COMMITTEE:

S. Bittanti -- Politecnico di Milano, Italy

P. Bolzern -- Politecnico di Milano, Italy

P. Colaneri -- Centro di Teoria dei Sistemi C.N.R., Italy

C. De Nicolao -- Centro di Teoria dei Sistemi C.N.R., Italy

In organizing the workshop, the organizers are being assisted by

the Centro di Cultura Scientifica A. Volta, Villa Olmo (Como).

The assistance of the Centro di Teoria dei Sistemi C.N.R., Mi-

lano, and the Dipartimento di Elettronica del Politecnico di Mi-

lano is also gratefully acknowledged.

LOCAL ARRANGEMENTS:

The Centro di Cultura Scientifica A. Volta will take care of the

local organization, including hotel reservations. An early

reservation is recommended since Como is already crowded with

tourists in June. The address of the Centro is:

Centro di Cultura Scientifica A. Volta

Villa Olmo

Via Cantoni 1

22100 Como

ITALY

Phone number: 31.552563 or 31.572213

Telex: 380547 CAM CO I

Electronic mail: GCASATI@IMICLVX.BITNET

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

From: Baker Kearfott <rbk%usl.csnet@relay.cs.net>

Date: Thu, 22 Sep 88 09:03:34 CDT

ANNOUNCEMENT

NINETEENTH ANNUAL USL MATHEMATICS CONFERENCE

OCTOBER 21 - 23, 1988

This year's weekend conference will be devoted to

analysis (classical, applied, and numerical). We expect to

follow the format of previous years, with colloquium type

talks beginning Friday afternoon and ending early Sunday

afternoon. We will also be inviting everyone to dinner

Friday evening and to the shrimp boil on Saturday evening.

A partial list of speakers is:

John Cannon (Office of Naval Research)

John Dennis (Rice University)

Bill Fitzgibbon (University of Houston)

Robin Forman (Rice University)

Jerry Goldstein (Tulane University)

Hans Kaper (Argonne National Labs.)

Chen-Yuen Lin (Texas A&M University)

Caruth McGehee (Louisiana State University)

Jeff Morgan (Texas A&M University)

John Polking (Rice University)

Gizele Rieder (Louisiana State University)

Ralph Saxton (University of New Orleans)

Phil Smith (IMSL)

Henry Warchall (University of North Texas)

John Wolfson (Tulane University)

You are welcome (RSVP). (However, there is no support other

than for the two dinners.) For information, for comments or

suggestions, or if you wish to make a presentation, please

contact:

Baker Kearfott (318) 231-5270 (Office)

(318) 981-9744 (Home)

kearfott%usl.csnet@relay.cs.net (EMAIL)

or:

Lloyd Roeling (318) 231-6545 (Office)

(318) 988-0148 (Home)

Mathematics Department (318) 231-6702

U. S. L. Box 4-1010

Lafayette, LA 70504

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

From: MA37%primea.dundee.ac.uk@NSS.Cs.Ucl.AC.UK

Date: Thu, 22 Sep 88 10:31:47

13th

BIENNIAL CONFERENCE

ON

NUMERICAL ANALYSIS

UNIVERSITY OF DUNDEE, SCOLAND, UK

27-30 June 1989

Principal Speakers include

M J Baines P Deuflhard T Lyche

J H Bramble R Fletcher M J D Powell

K Burrage I Graham A Ruhe

T Coleman C Johnson

A limited number of submitted papers will be presented. Full details

of submission dates, conference fees, etc. will be available towards

the end of 1988 and may be obtained by writing to either

Dr D F Griffiths or Dr G A Watson:

The Organizing Secretaries

Biennial Conference on Numerical Analysis

Department of Mathematics and Computer Science

The University

Dundee, DD1 4HN

Scotland, UK

Tel: 0382 23181 ext 4467/4474

e-mail:ma37@UK.AC.DUNDEE.PRIMEA

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

From: Gene Golub <golub@Patience.stanford.edu>

Date: Fri, 23 Sep 88 15:50:43 PDT

STANFORD UNIVERSITY

Department of Operations Research

The Department of Operations Research expects to have a tenure-track

position, possibly joint with the Department of Computer Science,

to be filled by September 1, 1989. We are soliciting applications

from candidates in the areas of combinatorial optimization and numerical

optimization. Candidates must have outstandinng research ability and

potential. They must also be committed to excellence in teaching.

The position requires the individual to teach on both the graduate and

undergraduate levels, to carry out an active research program, and to

provide research supervision for Ph.D. students. Candidates at both

the junior and senior levels will be considered, although we have a

preference for a younger scholar. Stanford is an equal opportunity/

affirmative action employer. Applications from women and minorities

are especially welcome.

Candidates should send a vita, the names of at least four references,

and copies of selected publications (if any) to Prof. Donald L.

Iglehart, Department of Operations Research, Terman Engineering

Center, Stanford University, Stanford, CA 94305-4022. Further

enquiries should be made to Professor Iglehart at 415/723-4094 or

Iglehart@sierra.stanford.edu.

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

End of NA Digest

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