Subject: NA Digest, V. 93, # 31 NA Digest Sunday, August 22, 1993 Volume 93 : Issue 31 Today's Editor: Cleve Moler The MathWorks, Inc. moler@mathworks.com Today's Topics: New Address for Alan Edelman Change of Address for Alan Craig SIAM Conferences How to Discriminate Between Typing Mistakes and Intentional Ones? Query on Convergence of Infinite Products of Matrices Software Package PARASPAR Anonymous FTP at Greenwich Nonlinear Elliptic PDE and Picard Iteration Numerical Solution of an Integral-differential Equation New Book on Parallel Multigrid Waveform Relaxation Symposium on Parallel Numerical mathematics Post Doctoral Position at The University of Queensland Post-Doc Position at Stanford Research Position at Argonne National Laboratory SAC '94 Special Track on Scientific Computing Stanford Reports Special Issue of LAA Honoring J. J. Seidel Student Edition of Interval Computations Contents: SIAM Numerical Analysis Contents: Computational and Appllied Mathematics 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: Alan Edelman Date: Mon, 16 Aug 93 17:19:21 EDT Subject: New Address for Alan Edelman New Address for Alan Edelman Alan Edelman Department of Mathematics Massachusetts Institute of Technology Cambridge, MA 02139 Office Phone: (617) 253-7770 Home Phone: (617) 566-3688 edelman@math.mit.edu ------------------------------ From: Alan Craig Date: Sun, 22 Aug 93 09:06:25 +0100 (BST) Subject: Change of Address for Alan Craig As from 1st September my new address will be Alan Craig INRIA Domaine de Voluceau BP 105 78153 Le Chesnay Cedex FRANCE email to Durham will still find me. Alan ------------------------------ From: Gene Golub Date: Sat, 21 Aug 93 10:40:41 PDT Subject: SIAM Conferences I recently attended the Third SIAM Conference on Linear Algebra Signals, Systems and Control in Seattle. Several persons made comments to me which I think should be discussed publicly. Perhaps in light of these comments, it is necessary to re-think the SIAM policy on conferences. Other organizations, please note. Here are some of those comments. 1) There are too many parallel sessions with too few attendees. 2) Talks were rehashs of talks given in the previous two years. 3) At least one session was dedicated to a commercial product: Matlab. 4) The meeting began too early in the morning, 8am. 5) This conference was organized by the same person who organized the previous ones. 6) Many talks had little to do with the main theme of the meeting. Perhaps the policy of accepting all abstracts and parallel sessions is now out of date. If you wish to make your comments known to the SIAM leadership, send a message to na.siam. Gene Golub ------------------------------ From: Giuseppe Paruolo Date: Tue, 17 Aug 93 09:16:32 +0000 (SET) Subject: How to Discriminate Between Typing Mistakes and Intentional Ones? Problem: a numeric code of about 11 digits must be specified in certain documents; some of the digits depends on the others, so it is possible to detect any mistake; since it is possible to extract a sample of the incorrect documents and perform a manual search to determine the correct codes, now the problem is to discriminate between typing mistakes and intentionally deceptive mistakes. Question: what is needed is a routine/algorithm/method, possibly certified or previously used in significant cases (or at least some pointer to the right place where to ask), aimed to discriminate between small errors - probably due to typing mistakes - and other kind of changes, subject to be investigated as deceptive actions. Thank you in advance. Giuseppe Paruolo - CINECA Supercomputing Center - Bologna, Italy ------------------------------ From: Paul Nevai Date: Tue, 17 Aug 1993 05:29:57 -0400 (AST) Subject: Query on Convergence of Infinite Products of Matrices We (Walter Van Assche and Paul Nevai) are interested in the convergence of the infinite product $\prod (I+A_n)$ where $I$ is the identity matrix and $A_n$'s are square matrices (of fixed finite order). We know that the infinite sums $\sum A_n$ (conditionally, elementwise) and $\sum ||A_n||^2$ (the square of the norms) converge. The matrices $A_n$ do not commute with each other. Under what (additional, if any) conditions can we conclude that $\prod A_n$ converges? Can you give me some references or suggestions who I should contact on such matters? Thanks...Paul Nevai P.S. We would be interested even in the case when the matrices are $2x2$ and the diagonal elements are always zero. Paul Nevai pali+@osu.edu Department of Mathematics nevai@math.ohio-state.edu The Ohio State University nevai@ohstpy.bitnet 231 West Eighteenth Avenue 1-614-292-3317 (Office) Columbus, Ohio 43210-1174 1-614-292-5310 (Answering Machine) The United States of America 1-614-292-1479 (Math Dept Fax) ------------------------------ From: D.J. Evans Date: Tues, 17th Aug 93 Subject: Software Package PARASPAR I should like to obtain details about the software package PARASPAR. Can anyone supply me with further information. Prof. D.J. Evans Parallel Algorithms Research Centre (PARC) Loughborough University Loughborough Leics. LE11 3TU, U.K. FAX: 0509-211586. ------------------------------ From: Choi-Hong Lai Date: Tue, 17 Aug 93 12:37:23 +0100 (BST) Subject: Anonymous FTP at Greenwich Anonymous FTP at the University of Greenwich: We have recently fixed our ftp facility. Therefore it is possible for you to obtain nma series by anonymous ftp to maths.gre.ac.uk and the nma series are recorded as .dvi files under the directory pub/nma. A readme file in pub/nma gives a brief description. This readme file will be updated from time to time as more reports are included into the series. A large number of people response to my previous message regarding the report nma001. I have sent off the tex file via email to some of the people before the ftp was fixed. Hardcopies were sent off to those who have specifically asked for. I apologise for not sending hardcopy to everyone. Choi-Hong Lai c.h.lai@greenwich.ac.uk University of Greenwich School of Math Stat & Comp Wellington Street Woolwich London SE18 6PF U K ------------------------------ From: Jalel Rejeb Date: Tue, 17 Aug 93 18:56:12 EDT Subject: Nonlinear Elliptic PDE and Picard Iteration We are trying to solve nonlinear elliptic equations of the form: Uxx + Uyy = f(U,x,y) Where f is nonlinear function of U. We need to solve for U(X,Y) in rectangular region and the boundary are of mixed type. We wish to solve this problem using point iteration method , known also as Picard Method. That is assume U = U(k-1) on the right side of Eq.1 during the k th iteration, until U(k) = U(K-1). So iterate the following linear equation until convergence: Uxx(k) + Uyy(k) = f(U(k-1),x,y) OUR question is there any way we can improve the accuracy and convergence of the point iteration method. We are obtaining results that are ok but!, but not as accurate as Newton Method ... Any advises and suggestions (or where should we look) are appreciated. Rejeb Email:jrejeb@owl.npac.syr.edu ------------------------------ From: Richard Franke <0083P%NAVPGS.BITNET@cmsa.Berkeley.EDU> Date: Thu, 19 Aug 93 10:42:27 PDT Subject: Numerical Solution of an Integral-differential Equation An engineering colleague recently asked about methods for solving a particular kind of integral-differential equation. I'm passing it on the the Digest. The equation is of the form x / f(x) = g(x) + | h(x-y) f"(y) dy / 0 If anyone can give any pointers to the literature, or other help, I'm sure he would appreciate it. A response can be made directly to me at rfranke@nps.navy.mil. Thanks. ------------------------------ From: Stefan Vandewalle Date: Wed, 18 Aug 93 11:25:24 +0200 Subject: New Book on Parallel Multigrid Waveform Relaxation I would like to announce the publication of the book: "Parallel Multigrid Waveform Relaxation for Parabolic Problems" by Stefan Vandewalle, in the series Teubner-Skripten zur Numerik, B.G. Teubner Stuttgart, Germany, 1993. (16.2 x 23.5 cm, 247 pages, DM 39.80, ISBN 3-519-02717-8) Abstract: Waveform relaxation is a highly parallel iterative method for solving very large systems of ordinary differential equations. Over the years this method has been applied almost exclusively for the systems that model VLSI electronic circuits. In the present work the author studies waveform relaxation methods for parabolic partial differential equations of initial boundary-value and time-periodic type. It is shown both theoretically and by numerical experimentation that waveform relaxation, when accelerated by using multigrid, is a highly effective algorithm. It combines a low serial complexity with a high parallel efficiency and it is easily vectorisable. The book starts with an introductory overview of the waveform relaxation theory and practice, and provides an in-depth analysis of multigrid waveform relaxation. It discusses the parallel implementation of classical time-stepping schemes and analyses the computational complexity of waveform relaxation methods. A large number of case- studies illustrate the performance of the methods for linear and nonlinear problems. ------------------------------ From: Tom Franklin Date: Mon, 16 Aug 93 16:30:55 +0100 (BST) Subject: Symposium on Parallel Numerical mathematics Symposium on Parallel Numerical Mathematics Sponsored by The Centre for Novel Computing University of Manchester and Manchester Centre for Computational Mathematics In conjunction with The London Mathematical Society To be held at Department of Computer Science Manchester University 9th and 10th September 1993 Speakers: Nick J Higham A Parallel Algorithm for Computing the Polar Decomposition Bo Kagstrom Design, Modelling and Evaluation of Shared Memory and Distributed Memory Danny C Sorensen Implicitly Restarted Arnoldi Methods for Large Scale Eigenvalue Problems Ken McKinnon Dynamic Programming on Distributed memory MIMD machines. Virginia Torczon Parallel Pattern Search Methods for Unconstrained Optimization Salvatore Filippone Numerical algorithms on distributed memory architectures. Eric Grosse Domain decomposition on an FDDI network Ian Gladwell Parallel Algorithms for Functional Equations Petter Bjorstad Guy Lonsdale Migrating Industrial Crash-simulation Software Full details available by anonymous ftp from vtx.ma.man.ac.uk (130.88.16.2) in pub/nareps/Parallel_Symposim.93 Tom. Tom Franklin Centre for Novel Computing Phone +44 61 275 6134 Department of Computer Science Fax +44 61 275 6204 University of Manchester Manchester email tomf@cs.man.ac.uk M13 9PL ------------------------------ From: John Belward Date: Wed, 18 Aug 93 10:25:45 EST Subject: Post Doctoral Position at The University of Queensland THE UNIVERSITY OF QUEENSLAND High Performance Computing Unit Post Doctoral Research Fellow The University of Queensland is seeking a PostDoctoral Research Fellow for it's recently established High Performance Computing Unit. The Unit has a 4096 processor Maspar and will have Cray Y-MP supercomputer installed by September 1 next. The functions of the Unit are to encourage multidisciplinary projects in the area of High Performance Computing to provide research into High Performance Computing methodologies to initiate and provide support for High Performance Computing applications in industry, commerce and research. Applicants should have experience with vector architectures, knowledge and expertise in MIMD and/or distributed configurations and research interests in Computational Mathematics. The research program for the unit will include collaborative work with the Queensland Department of Primary Industries. The successful appointee will work closely with The Department of Mathematics Scientific Computing Group. The appointment will be for a period of 18 months in the first instance. Further details can be obtained from Professor Kevin Burrage. Addresses are: e-mail kb@maths.uq.oz.au fax Int + 61 7 3651477 Postal address Department of Mathematics The University of Queensland Queensland 4072 Australia. ------------------------------ From: Gene Golub Date: Sun, 22 Aug 93 13:48:28 PDT Subject: Post-Doc Position at Stanford We are seeking a person who has a doctorate in the mathematical or engineering sciences who has an interest in the development of numerical algorithms, especially linear algebra applications to signal processing. Applicants should be available as of Oct 1, 1993 or soon thereafter. Persons interested should send a copy of their CV and relevant papers to Gene Golub. Post-doc positions of this nature have been previously held by such persons as Paul Vandooren, George Cybenko, Bart De Moor and Kjell Gustafsson. Gene Golub Gene Golub, Fletcher Jones Professor of Computer Science Director, Scientific Computing/ Computational Math Office: Margaret Jacks Hall, Room 306 Office Phone: 415/723-3124 Home Phone: 415/323-0105 Office FAX : 415/723-2411 Home FAX : 415/323-0105 ------------------------------ From: Jorge More Date: Wed, 18 Aug 1993 15:32:55 -0500 Subject: Research Position at Argonne National Laboratory Research Position Mathematics and Computer Science Division Argonne National Laboratory Argonne National Laboratory invites outstanding candidates to apply for a research position in the Mathematics and Computer Science Division. Candidates should have a Ph.D. in applied mathematics, computer science, or a related field and at least three years of research experience. The division has strong research programs in scientific computing, linear algebra, optimization, partial differential equations, and computer science areas such as software tools for parallel computing, scalable I/O, and advanced scientific visualization. We seek a candidate with a research agenda to augment these programs in addition to a strong interest in the development of state-of-the-art numerical methods for solving computational science problems. The Mathematics and Computer Science Division supports an excellent computational environment that includes high-performance scientific workstations, a scientific visualization laboratory, and state-of-the-art parallel computers (including the IBM SP-1 and access to the Intel Touchstone DELTA). Applications should be addressed to Walter McFall, Box mcs-108450, Employment and Placement, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL 60439, and must include a resume' and the names and addresses of three references. For further information, contact Jorge More' or Rick L. Stevens (more@mcs.anl.gov; 708-252-7162). Argonne is an affirmative action/equal opportunity employer. ------------------------------ From: Richard Sincovec Date: Fri, 20 Aug 93 16:31:08 -0400 Subject: SAC '94 Special Track on Scientific Computing Call For Papers 1994 SYMPOSIUM ON APPLIED COMPUTING (SAC '94) SPECIAL TRACK ON SCIENTIFIC COMPUTING March 6-8, 1994 Phoenix Civic Plaza, Phoenix, Arizona SAC'94 SAC'94 is the annual conference of the ACM Special Interest Group on Applied Computing (SIGAPP). For the past eight years, SAC's have been a primary forum for applied computing practitioners and researchers. Again this year, SAC'94 will be held in conjunction with the 1994 ACM Computer Science Conference in Phoenix. State-of-the-Art and State-of-the- Practice papers in all areas of applied computing are invited. Special track on Scientific Computing (SC) A special track on Scientific Computing will be held in SAC' 94. It will be a forum for engineers, researchers and prac- titioners throughout the world to share technical ideas and experiences relating to implementation and application of Scientific Computing. Original papers and tutorial (half or full day) and panel proposals are invited in all areas of SC applications. Major topics of interest include but are not limited to the following: Agronomy Aerospace & Aviation Animal Science Biochemistry Biology (except Biomedical) Botany Chemistry Engineering (all areas) Entomology Forestry Geography Horticulture Microbiology Petrochemicals Petroleum Engineering Physics Physiology Psychology Technology Transfer Zoology Scientific Computing Track Advisory Committee Ken Barker University of Manitoba (CA) Hossein Hakimzadeh Indiana University Ramzi Haraty The Aerospace Corporation Sushil Jajodia George Mason University Ken Nygard North Dakota State University Richard F. Sincovec Oak Ridge National Laboratory Bhavani Thuraisingham The MITRE Corporation LiQuan Qi University of New South Wales (AU) Andy Walker Nottingham University (UK) Lonny Winrich University of North Dakota Cui-Qing Yang University of North Texas Osman Yasar University of Wisconsin-Madison Guidelines For Submission Original papers from the above-mentioned areas will be con- sidered. Accepted articles will be published in the SAC'94 Conference Proceedings to be published by the ACM Press. Best student papers will qualify for awards. Expanded ver- sions of selected papers from all categories will be con- sidered for publication in the ACM/SIGAPP quarterly APPLIED COMPUTING REVIEW. In order to facilitate the blind external review process, submission guidelines must be strictly adhered to: o Submit 6 copies of manuscript to the SAC'94 Scientific Computing track chair at the address below. o Author name(s) and address(es) are NOT to appear in the body of the paper, and self-reference should be in third person. o Body of paper should not exceed 5,000 words (approx. 20 pages, double-spaced). o Separate cover sheet should be attached to each copy, containing (1) title, (2) author(s) and affiliation(s), and (3) address (including e-mail and fax number) to which correspondence should be addressed. o In order to qualify as a student paper, ALL authors must be students at the time the manuscript was submit- ted. o All papers and panel proposals must be submitted by September 1, 1993. SAC'94 Co-Sponsoring SIGs SIGAPL (APL), SIGAPP (Applied Computing), SIGBIT (Business Information Technology), SIGBIO (Biomedical Computing), SIGCUE (Computer Uses in Education), SIGFORTH (FORTH) and SIGSMALL/PC (Small and Personal Computing Systems and Appli- cations. Direct Correspondence, Inquiries And Submissions Relating To This Special Track To: Mahir S. Ali (SAC94 Scientific Computing Track Chair) Department of Computer Science University of North Dakota P.O. Box 9015 Garnd Forks, ND 58202-9015 E-mail: ali@cs.und.nodak.edu Tel: (701) 777-4107 Fax: (701) 777-3330 IMPORTANT DATES SEPTEMBER 1, 1993 PAPERS AND PANEL SUBMISSION OCTOBER 15, 1993 AUTHOR NOTIFICATION NOVEMBER 20, 1993 CAMERA-READY COPY MARCH 6, 1994 CONFERENCE BEGINS For General Inquires Contact The Conference Director: Ed Deaton Dept. of Mathematical Sciences San Diego State University San Diego, CA 92182 Email: deaton@cs.sdsu.edu Tel: +1 619 594 5962 Fax: +1 619 594 6746 ------------------------------ From: Gene Golub Date: Sat, 21 Aug 93 13:12:34 PDT Subject: Stanford Reports The following Stanford reports are available, on a limited basis, in hard copy. Please send a message to my secretary, Beverly Harlan, (harlan@sccm.stanford.edu) giving your postal address. Thanks. Gene Golub Manuscript NA-92-05, May 1992 Adaptive Chebyshev Iterative Methods for Nonsymmetric Linear Systems Based on Modified Moments, by D. Calvetti, G.H. Golub, and L. Reichel. Manuscript NA-92-06, July 1992 Fast Iterative Solution of Stabilized Stokes Systems; Part II: Using Block Preconditioners, by David Silvester and Andrew Wathen. Manuscript NA-92-07, August 1992 The Periodic Schur Decomposition. Algorithms and Applicationsk, by A. Bojanczyk, G.H. Golub, and P. Van Dooren. Manuscript NA-92-08, August 1992 A Domain Decomposition Approach to Solving the Helmholtz Equation with a Radiation Boundary Condition, by Oliver Ernst and Gene H. Golub. Manuscript NA-92-09, August 1992 An Implementation of a Generalized Lanczos Procedure for Structural Dynamic Analysis on Distributed Memory Computers, by David R. Mackay and Kincho H. Law. Manuscript NA-92-10, August 1992 A Parallel Row-Oriented sparse Solution Method for Finite Element Structural Analysis, by Kincho H. Law and David R. Mackay. Manuscript NA-92-11, September 1992 A New Approach For Solving Perturbed Symmetric Eigenvalue Problems, by Cheryl Carey, Hsin-Chu Chen, Gene Golub, and Ahmed Sameh. Manuscript NA-92-12, September 1992 Matrix shapes invariant under the symmetric QR algorithm, by Peter Arbenz and Gene H. Golub. Manuscript NA-92-13, September 1992 The canonical correlations of matrix pairs and their numerical computation, by Gene H. Golub and Hongyuan Zha. Manuscript NA-92-14, September 1992 Cyclic reduction/multigrid, by Gene H. Golub and Ray S. Tuminaro. Manuscript NA-92-15, October 1992 Fast solution of the Helmholtz equation with radiation condition by imbedding, by Oliver Ernst Manuscript NA-92-16, November 1992 Model problems in numerical stability theory for initial value problems, by A.M. Stuart and A.R. Humphries. Manuscript NA-92-17, November 1992 Runge-Kutta methods for dissipative and gradient dynamical systems, by A.R. Humphries and A.M. Stuart. Manuscript NA-92-18, November 1992 An analysis of local error control for dissipative, contractive and gradient dynamical systems, by A.M. Stuart and A.R. Humphries. Manuscript NA-92-19, December 1992 Eulerian number asymptotics from a recursion equation, by E. Giladi and J.B. Keller. Manuscript NA-92-20, December 1992 Use of linear algebra kernels to build an efficient finite element solver, by Howard C. Elman and Dennis K.Y. Lee. Manuscript NA-92-21, December 1992 On the error computation for polynomial based iteration methods, by B. Fischer and G.H. Golub. Manuscript NA-93-01, May 1993 Fifth Annual Affiliates Meeting, May 7, 1993, sponsored by Scientific Computing and Computational Mathematics Program. Manuscript NA-93-02, June 1993 Inexact and preconditioned Uzawa algorithms for saddle point problems, by Howard C. Elman and Gene H. Golub. Manuscript NA-93-03, June 1993 A Lanczos-based method for structural dynamic re-analysis problems, by Cheryl M. M. Carey, Gene H. Golub, and Kincho H. Law. Manuscript NA-93-04, July 1993 A multishift QR iteration without computation of the shifts, by Augustin A. Dubrulle and Gene H. Golub. ------------------------------ From: Richard Brualdi Date: Tue, 17 Aug 1993 07:02:25 -0500 (CDT) Subject: Special Issue of LAA Honoring J. J. Seidel Linear Algebra and its Applications Special Issue in Honor of J. J. Seidel We are pleased to announce a special issue of LAA in honor of J. J. Seidel in recognition of his many important and elegant contributions to the interplay between linear algebra and combinatorics and geometry. Papers are invited concerning any aspect of linear algebra and its applications, in particular, its application to combinatorics and geometry. All contributions will be subject to the normal reviewing process. The deadline for submissions is August 30, 1994. Submissions should be sent to one of the special editors of this issue: Aart Blokhuis Department of Mathematics and Computer Science Technical University of Eindhoven P.O. Box 513 5600 MB Eindhoven, The Netherlands Email: aartb@win.tue.nl Willem H. Haemers Department of Econometrics Tilburg University P.O. Box 90153 5000 LE Tilburg, The Netherlands Email: haemers@kub.nl Alan J. Hoffman Department of Mathematical Sciences IBM Research Division T. J. Watson Research Center P.O. Box 218 Yorktown Heights, NY 10598. Email: hoffa@watson.ibm.com Papers can also be sent to the editor-in-chief: Richard A. Brualdi Department of Mathematics University of Wisconsin 480 Lincoln Drive Madison, WI 53706. Email: brualdi@math.wisc.edu We invite you to join in honoring our esteemed colleague. ------------------------------ From: Ralph B Kearfott Date: Sun, 22 Aug 1993 03:36:48 -0500 Subject: Student Edition of Interval Computations CALL FOR PAPERS Announcing special STUDENT ISSUE of the International INTERVAL COMPUTATIONS Journal. Guest editors: Guenther Mayer and Vladik Kreinovich The future of Interval Computations is with the students researchers entering the field. Their vision, their insights, their approaches will shape the future research. To highlight their contributions, the Editorial Board of the Interval Computations Journal decided to make a special issue that will contain high-quality papers written by students (either alone, or in co-authorship with their professors). These papers will undergo the same refereeing as all the other papers. We will try our best to publish this issue as fast as possible. Papers authored or co-authored by students will be automatically entered into a Best Paper contest. The Editorial Board of the Interval Computations Journal will choose the winning paper. The student author of the best paper will be given a special certificate and a free one-year subscription to Interval Computations. Papers should be written in any version of TeX (preferably AMS-TeX). Please submit your papers to Vladik Kreinovich Department of Computer Science University of Texas at El Paso El Paso, TX 79968 phone (915) 747-6951 fax (915) 747-5030 email vladik@cs.ep.utexas.edu Deadline for abstracts: December 1, 1993 Deadline for papers: March 1, 1994 ------------------------------ From: SIAM Date: Fri, 20 Aug 93 08:31:33 EST Subject: Contents: SIAM Numerical Analysis TABLE OF CONTENTS SIAM Journal on Numerical Analysis, v.30, no.6 DECEMBER 1993 Domain Decomposition Type Iterative Techniques for Parabolic Problems on Locally Refined Grids Richard E. Ewing, Raytcho D. Lazarov, Joseph E. Pasciak, Panayot S. Vassilevsky A Quasi-Monte Carlo Approach to Particle Simulation of the Heat Equation William J. Morokoff and Russel E. Caflisch Estimation of Variable Coefficients in the Fokker-Planck Equations Using Moving Node Finite Elements H.T. Banks, H.T. Tran, and D.E. Woodward On the Question of Turbulence Modeling by Approximate Inertial Manifolds and the Nonlinear Galerkin Method John G. Heywood and Rolf Rannacher The Global Dynamics of Discrete Semilinear Parabolic Equations C.M. Elliott and A.M. Stuart A New Scheme for the Approximation of Advection-Diffusion Equations by Collocation Daniele Funaro Numerical Methods for the Simulation of Flow in Root-Soil Systems Todd Arbogast, Mandri Obeyesekere, and Mary F. Wheeler Solution of Nonlinear Diffusion Problems by Linear Approximation Schemes J. Kacur, A. Handlovicova, and M. Kacurova Application of Global Methods in Parallel Shooting M.E. Kramer and R.M.M. Mattheij FFT-Based Preconditioners for Teoplitz-Block Least Squares Problems Raymond H. Chan, James G. Nagy, and Robert J. Plemmons Quadrature Methods for Strongly Elliptic Equations of Negative Order on Smooth Closed Curves J. Saranen and L. Schroderus Optimal A-Poseriori Parameter Choice for Tikhonov Regularization for Solving Nonlinear Ill-posed Problems O. Scherzer, H.W. Engl, and K. Kunisch ------------------------------ From: Carlos Moura Date: Fri, 20 Aug 93 17:36:47 EST Subject: Contents: Computational and Appllied Mathematics COMPUTATIONAL AND APPLIED MATHEMATICS (Matematica Aplicada e Computacional) Vol. 11, Issue 3, 1992 Dongwoo SHEEN A numerical method for approximating wave propagation in a porous medium saturated by a two-phase fluid J. Mario MARTINEZ On the global convergence of a curvilinear search method for unconstrained optimization A. B. PEREIRA Nordsieck forms of stiffly-stable Adams-type cyclic methods that are insensitive to step-size changes Carlos HUMES Jr. A projection-feasible direction method for continuous capacity flow assignement K.-H. HOFFMANN and Liu XIYUAN Differentiable dependence on data and optimal control of a Muskat problem for imminscible fluids in porous media Oscar H. BUSTOS and Alejandro C. FREY Addendum ------------------------------ End of NA Digest ************************** -------