From nacomb@surfer.EPM.ORNL.GOV Sun Jan 19 14:28:42 1992 Return-Path: Received: from surfer.EPM.ORNL.GOV by CS.UTK.EDU with SMTP (5.61++/2.7s-UTK) id AA08744; Sun, 19 Jan 92 14:28:36 -0500 Received: by surfer.EPM.ORNL.GOV (5.61/1.34) id AA19523; Sun, 19 Jan 92 14:28:21 -0500 Date: Sun, 19 Jan 92 14:28:21 -0500 From: nacomb@surfer.EPM.ORNL.GOV (NA-NET) Message-Id: <9201191928.AA19523@surfer.EPM.ORNL.GOV> Subject: NA Digest, V. 92, # 3 Apparently-To: dongarra@cs.utk.edu Status: R NA Digest Sunday, January 19, 1992 Volume 92 : Issue 3 Today's Editor: Cleve Moler The MathWorks, Inc. moler@mathworks.com Today's Topics: CRA Database on Female Computer Scientists Good Random Numbers, Response to Jeffrey Dunn Re: Good Random Number Generators 3-D Attitude "Vectors" Graduate Computational S & E Degree at Rice University Postdoc at SUNY, Stony Brook Postdoc Position at Lawrence Berkeley Lab IMACS Conference on Computer Methods for PDE's Conference at Kent State on Linear Algebra and Computing Contents, Surveys on Mathematics for Industry Contents, SIAM Control and Optimization Contents, Linear Algebra and Applications 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 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? 7. Postal address 8. Email address 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? Advisor 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 (D) Undergraduates (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 access to users in other categories. (A) Employment search committees (B) Conference organizers, program chairs, journal editors-in-chief, and similar project leaders (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 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 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 Date: Thu, 16 Jan 92 00:57 MET Subject: 3-D Attitude "Vectors" Dear na-net readers, 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 ------------------------------ From: Dan Sorensen 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 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 above address. ------------------------------ From: Paul Concus 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 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 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 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) Vol. 1 no.3, 1991, Table of Contents: 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 Date: Mon, 13 Jan 92 09:46:25 EST Subject: Contents, SIAM Control and Optimization Table of Contents 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 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 Bryan L. Shader (Madison, Wisconsin) On Tournament Matrices Ahmad Muchlis (Madison, Wisconsin) 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 ************************** -------