IPNet Digest Volume 4, Number 05 May 31, 1997 Today's Editor: Patricia K. Lamm Michigan State University Today's Topics: Tutorial: Solving ill-conditioned and singular linear systems Research Summary: Inverse Problems & Complex Proc. Analysis III Workshop: Computational and Applied Mathematics II Meeting: SIAM 45th Anniversary & Annual Meeting Tutorial: Multiscale Image Analysis Table of Contents: Inverse Problems Table of Contents: SIAM Review Table of Contents: SIAM J. Numerical Analysis Table of Contents: SIAM J. Control and Optimization Table of Contents: Computational and Applied Mathematics Table of Contents: Advances in Computational Mathematics Table of Contents: Numerical Algorithms Table of Contents: Mathematics of Control, Signals, and Systems Submissions for IPNet Digest: Mail to ipnet-digest@math.msu.edu Information about IPNet: Mail to ipnet-request@math.msu.edu http://www.mth.msu.edu/ipnet ------------------------------ From: Arnold Neumaier Date: Wed, 07 May 1997 18:23:08 +0200 Solving ill-conditioned and singular linear systems Have you ever needed to solve an ill-conditioned linear system, but found no satisfactory textbook answers? Have you ever wanted to understand regularization techniques, but were put off by the funcional analytic or stochastic background needed for digesting the relevant literature? Have you ever tried to teach about regularization in a numerical analysis course but couldn't do it for lack of a quickly accessible approach to the subject? The following survey paper might give you the information you need with a minimal amount of technicalities. * - * - * Arnold Neumaier, Solving ill-conditioned and singular linear systems: A tutorial on regularization It is shown that the basic regularization procedures for finding meaningful approximate solutions of ill-conditioned or singular linear systems can be phrased in terms of simple linear algebra that can be taught in any numerical analysis course. Apart from rewriting many known results in a simpler form, we also derive a new two-parameter family of merit functions for the determination of the regularization parameter. The traditional merit functions from generalized cross validation (GCV) and generalized maximum likelihood (GML) are recovered as special cases. The paper can be retrieved from the WWW site http://solon.cma.univie.ac.at/~neum/papers.html#reg * - * - * Titles of some other recent papers available: * Book review of ``Janos D. Pinter, Global Optimization in Action'' * Global optimization by multilevel coordinate search * On satisfying second-order optimality conditions using modified Cholesky factorizations * Parameter estimation and confidence regions for multivariate autoregressive and Ornstein-Uhlenbeck processes * Scaling and structural condition numbers ------------------------------ From: pointltd@glasnet.ru Subject: About IP investigation Date: Mon, 19 May 1997 20:35:58 +0400 (WSU DST) Subject: INVERSE PROBLEMS TECHNIQUE FOR THE COMPLEX PROCESSES ANALYSIS Date: 05.19.97 Dear colleagues! Here is the third part of investigation, which deals with inverse problems applications for the complex processes analysis. It devotes to "Numerical Aspects of Stability and Optimal Regularization of Inverse Problems". At the previous IPNet Digest Vol.4, No.3, No.4 it was described the part 1 (uniqueness) and part 2 (experimental design). I should like to describe the main purpose and results of third part. Having shown, that inverse problems statement can to increase a number of simultaneously determined unknowns (part 1), as well as that for their finding significant decrease of observation volume is allowed (part 2), it is required to give a method for unknown object properties determination based on measurements, which are made at single experiment. The main purpose of a part 3 is practical recommendations development for ill-posed problems regularization. They must to give satisfactory identification accuracy of several unknown functions for a wide class of mathematical model when observations have final (not zero) level of measurements noise. Questions, which give attention. 1. How to avoid difficulties of determination of optimum regularization parameter or its some weight factors analogues, when anybody concentrated on the least squares formulation and standard Tikhonov regularization has not been very helpful? 2. What factors provide satisfactory accuracy of the IP solution in case, when observations have a not improvement measurements errors? Including, is regularization research sufficient for the practical tasks, when measurements errors are asymptotically decrease? 3. Is it possible to get satisfactory accuracy of the solution, when the coordination with a level of measurements errors is achieved, but restriction of admissible solution area is not executed sufficient, and on the contrary, sufficient restriction of admissible solution area is made, but coordination with a errors level of measurements is executed only in whole sampling? 4. Which requirements to regularization methods need to be presented for achievement solution with minimum identification error? In particular, how to choose regularization functional and which there should be norms of the coordination with observations? Decision of these questions has allowed to develop the regularization scheme, which can be used for a wide class of inverse problems. It permits: - - to avoid difficulties of regularization parameter determination; - - to make the proximity of the observed and model-calculated states to within the measurement noise level separately on each point of observation; - - to execute any required restriction of admissible solution area; - - to use such regularization for restoration of initial and boundary conditions, identification of linear and nonlinear parameters of differential equations, finding source functions and etc. For everybody who are interested in receiving the answers on these questions please contact with me via e-mail. I should like to send the summary and papers. Best regards Mikhail Romanovski pointltd@glas.apc.org ------------------------------ From: victor@ca.wai.com (Victor Pereyra) Subject: II PWACM Date: Wed, 30 Apr 1997 Second Pan American Workshop in Computational and Applied Mathematics. Gramado, Brazil, September 8-12, 1997 This five-day Workshop will cover selected areas of computational and applied mathematics. It is a sequel to the one that was held in Caracas, Venezuela in January 1993. The areas of concentration in this Workshop will again be chosen among those of substantial interest to the nations of this hemisphere. One of the main purposes is to help establish further contacts among computational and applied mathematicians in the hemisphere, with the goal of solving problems of significant economic and environmental importance to the region. There is a growing interest in this subject in the Americas, and an increase in the use of mathematical and computer modeling to help in the solution of societal problems, such as the effects of deforestation, pollution control and oil exploration and recovery. The declining cost of computing and the increasing availability of computer networks is begining to make such modeling available, even in developing countries. At this time, it is estimated that there are approximately 600 applied and computational mathematicians in Latin America. In addition, there is a large number of engineers and scientists with strong interest in the subject. The organizers are expecting a total attendance of 600 people, with at least 500 from Latin American countries. This event will conincide with the annual convention of the Brazilian Society of Applied and Computational Mathematics. For timely information on this conference on the Web, see: http://math.unm.edu/ACA/PanAm.html We are seeking funds from NSF, which supported the first Workshop, and have a commitment from SIAM for help in promotional and other aspects. There will be Proceedings published by Birkhauser-Verlag as an special issue of Matematica Aplicada e Computacional, the Brazilian Journal of Applied and Computational Mathematics. Victor Pereyra, Chairman, Program Committee Weidlinger Associates, Los Altos, CA, USA ------------------------------ From: flores@siam.org Subject: SIAM 45th Anniversaryt & Annual Meeting... Date: Thu, 15 May 97 08:36:57 EST SIAM 45th Anniversary and Annual Meeting Stanford University, July 14-18, 1997 Please make note of the following deadlines for hotels and dormitory reservations: June 11, 1997 - Stanford Terrace Inn Telephone: 415-857-0333 June 11, 1997 - Holiday Inn Palo Alto Telephone: 415-328-2800 June 15, 1997 - Hyatt Rickeys Telephone: 415-493-8000 June 30, 1997 - Stanford University Governor's Complex (Dorms) Contact SIAM, Telephone: 215-382-9800 meetings@siam.org June 30, 1997 - Deadline for Advance Registrations Contact SIAM, Telephone: 215-382-9800 meetings@siam.org For more information about the meeting, dormitory, hotels, transportation, and registration, and to obtain the fill-in forms to make a reservation or registration, visit the World Wide Web at: http://www.siam.org/meetings/an97/an97home.htm. See you in Stanford! The Meeting Organizers ------------------------------ From: "Bart M. ter Haar Romeny" Subject: Tutorial Multiscale Image Analysis Date: Fri, 16 May 1997 16:00:16 +0200 (MDT) Announcement: At the upcoming conference "Scale-Space'97", 2-4 July 1997 at Utrecht University, a tutorial on "Multiscale Image Analysis and Front-End Vision: Introduction to Scale-Space Theory" will be given on July 1, 1997, in reaction to multiple requests. NB: This is the afternoon BEFORE the conference Scale-Space'97. Attendance is free for registrants of the conference. Lecturer: Bart M. ter Haar Romeny, PhD, Utrecht University Date: Tuesday July 1, 1997 Place: University Hospital Utrecht, Room C5 Time: 14:00 - 17:00 Topics: Notion of scale in physics and mathematics Physics of observation, apertures Axiomatic derivation of some aperture kernels Differentiation, ill-/well-posedness and scale History of scale-space theory development Images as regular distributions The human visual pathway, receptive field (RF) structure Retinal distribution of RF's, feedback in the visual system Gaussian derivatives and the diffusion equation Some differential geometry on images in 2D, 3D, 2D-time Geometric invariants, tensors Applications in medical imaging Multiscale optic flow Nonlinear, geometry-driven diffusion schemes Divergence forms Variational (energy minimization) schemes Curve evolution Diffusion tensor diffusion Summary URL's: Scale-Space'97: http://www.cv.ruu.nl/Conferences/ScaleSpace97.html Tutorial: http://www.cv.ruu.nl/Conferences/Tutorial.html (incl. lecture notes) Registration for the conference: See the Web page, or send an email at scalespace97@cv.ruu.nl to receive the registration forms. Bart M. ter Haar Romeny Ph.D. E-mail: Bart.terHaarRomeny@cv.ruu.nl Image Sciences Institute Tel: +31-30-2508197 / 2507772 (secr) University Hospital Utrecht, E01.334 Fax: +31-30-2513399 Heidelberglaan 100, 3584 CX Utrecht, ftp: ftp.cv.ruu.nl The Netherlands URL: http://www.cv.ruu.nl ------------------------------ From: Janet Thomas Subject: Contents list for Inverse Problems Date: Fri, 16 May 1997 14:08:37 +0100 Inverse Problems Vol. 13, Issue 3, June 1997 Pages: L7-L10, 555-886 LETTER TO THE EDITOR Solving the Kadomtsev--Petviashvili equation with initial data not vanishing at large distances M Boiti, F Pempinelli and A Pogrebkov THE US DOD: RESEARCH INTERESTS IN INVERSE PROBLEMS Guest Editors' introduction J R McLaughlin and W W Symes Discrimination of buried targets via the singularity expansion C E Baum Some issues in inverse synthetic aperture radar image reconstruction B Borden Scattering and inverse scattering of sound-hard obstacles via shape deformation D N Ghosh Roy, L Couchman and J Warner PAPERS Regularization of a two-dimensional two-phase inverse Stefan problem D D Ang, A Pham Ngoc Dinh and D N Thanh Microwave imaging of time-varying radar targets J Bertrand and P Bertrand Inverse scattering via skin effect Y Chen Generalized Radon transform inversions for reflectivity in anisotropic elastic media M V de Hoop and N Bleistein Transient external 3D excitation of a dispersive and anisotropic slab J Frid\'en and G Kristensson Discretization and regularization of an inverse problem related to a quasilinear hyperbolic integrodifferential equation J Janno Some Newton-type methods for the regularization of nonlinear ill-posed problems B Kaltenbacher Bi-Hamiltonian formalism and the Darboux--Crum method: I. From the KP to the mKP hierarchy F Magri and J P Zubelli Uniqueness and numerical recovery of a potential on the real line J L Mueller and T S Shores The inverse problem in optics of stratified media with discontinuous parameters K V Popov and A V Tikhonravov On the choice of the regularization parameter for ordinary and iterated Tikhonov regularization of nonlinear ill-posed problems Qi-Nian Jin and Zong-Yi Hou Iterative reconstruction of images from incomplete spectral data J B Rhebergen, P M van den Berg and T M Habashy An inverse method for an expanding heated tube D Sylvester Binary Darboux transformations for constrained KP hierarchies R Willox, I Loris and C R Gilson Inverse scattering for time-varying one-dimensional layered media: algorithms and applications A E Yagle INVERSE PROBLEMS NEWSLETTER For further information on Inverse Problems, and all Institute of Physics Publishing journals and electronic products see http://www.iop.org Janet Thomas Production Editor Institute of Physics Publishing Dirac House, Temple Back, Bristol BS1 6BE, UK Tel: +44 (0)117 930 1081 Fax: +44 (0)117 929 4318 E-mail: janet.thomas@ioppublishing.co.uk WWW: http://www.iop.org (** Please note new postal address **) ------------------------------ From: poulson@siam.org Subject: Contents, SIAM Review Date: Mon, 05 May 97 14:49:35 EST SIAM Review June 1997 Volume 39, Number 2 Table of Contents Articles Solving a Polynomial Equation: Some History and Recent Progress Victor Y. Pan A Class of Codimension-Two Free Boundary Problems S. D. Howison, J. D. Morgan, and J. R. Ockendon Computing an Eigenvector with Inverse Iteration Ilse C. F. Ipsen Classroom Notes On the Limits of the Lagrange Multiplier Rule Luis A. Fernandez The Lagrange--Charpit Method Manuel Delgado A Unified Elementary Approach to Canonical Forms of Matrices John Karro and Chi-Kwong Li Putting Constraints in Optimization for First Year Calculus Students Kelly Black Some Eigenvalue Properties of Persymmetric Matrices Russell M. Reid Problems and Solutions Book Reviews Selected Topics in Approximation and Computation (Marek A. Kowalski, Krzysztof A. Sikorski, and Frank Stenger), Borislav Bojanov An Introduction to Symbolic Dynamics and Coding (Douglas Lind and Brian Marcus), Mike Boyle An Introduction to Linear and Nonlinear Scattering Theory (G. F. Roach), David L. Coulton Introduction to Disjunctive Kriging and Non-Linear Geostatistics (J. Rivoirard), Noel Cressie Multivariate Geostatistics (Hans Wackernagel), Victor De Oliveira and Benjamin Kedem Analysis of Algorithms---Computational Methods and Mathematical Tools (Micha Hofri), Philippe Flajolet The CRC Handbook of Combinatorial Designs (Charles J. Colbourn and Jeffrey H. Dinitz), Katherine Heinrich The Hilbert Transform of Schwartz Distributions and Applications (J. N. Pandey), Philip Heywood Qualitative Estimates for Partial Differential Equations: An Introduction (James N. Flavin and Salvatore Rionero), Cornelius O. Horgan Parallel and Sequential Methods for Ordinary Differential Equations (Kevin Burrage), Ken Jackson Handbook of Exact Solutions for Ordinary Differential Equations (A. D. Polyanin and V. F. Zaitsev), Murray S. Klamkin Exact Controllability and Stabilization: The Multiplier Method (V. Komornik), John E. Lagnese Group Theory and Physics (S. Sternberg), Ivailo M. Mladenov Elliptic Marching Methods for Domain Decomposition (Patrick J. Roache), Diego A. Murio Special Functions: An Introduction to the Classical Functions of Mathematical Physics (Nico M. Temme), Frank W. J. Olver Stable Non-Gaussian Random Processes (Gennady Samorodnitsky and Murad S. Taqqu), Magda Peligrad Nonlinear Waves in Elastic Media (A. Kulikovskii and E. Sveshmikova), Michael Renardy Numerical Methods for Differential Equations: A Computational Approach (John R. Dormand), Lawrence F. Shampine Integral Equations: Theory and Numerical Treatment (Wolfgang Hackbusch), Ian H. Sloan Handbook on Splines for the User (Eugene V. Shikin and Alexander I. Plis), Helmut Spath Time Dependent Problems and Difference Methods (Bertil Gustafsson, Heinz-Otto Kreiss, and Joseph Oliger), Endre Suli Applied Continuum Mechanics (T. J. Chung), Peter Wolfe Conservative Finite-Difference Methods on General Grids (Mikhail Shashkov), Zhimin Zhang Selected Collections Later Editions Chronicle From: Deborah Poulson, Production Editor SIAM Review ------------------------------ From: sisson@siam.org Subject: Contents, SIAM Journal on Numerical Analysis Date: Mon, 05 May 97 09:28:44 EST SIAM Journal on Numerical Analysis June 1997 Volume 34, Number 3 Table of Contents Computation of Singularities in Large Nonlinear Systems W. Govaerts Stability and Convergence of a Finite Element Method for Reactive Transport in Ground Water Zhangxin Chen and Richard E. Ewing Scattered Data Interpolation Using C2 Supersplines of Degree Six Ming-Jun Lai and Larry L. Schumaker Subdivision Direction Selection in Interval Methods for Global Optimization T. Csendes and D. Ratz Preconditioning Chebyshev Spectral Collocation by Finite-Difference Operators Sang Dong Kim and Seymour V. Parter Optimal L1-Rate of Convergence for the Viscosity Method and Monotone Scheme to Piecewise Constant Solutions with Shocks Zhen-Huan Teng and Pingwen Zhang Mesh Smoothing Using A Posteriori Error Estimates Randolph E. Bank and R. Kent Smith A Convergence Analysis of an h-Version Finite-Element Method with High-Order Elements for Two-Dimensional Elasto-Plasticity Problems Yiwei Li and Ivo Babuska A Finite-Element Method for Laplace- and Helmholtz-Type Boundary Value Problems with Singularities Xiaonan Wu and Houde Han A Sequential Regularization Method for Time-Dependent Incompressible Navier-Stokes Equations Ping Lin Analysis of the Inexact Uzawa Algorithm for Saddle Point Problems James H. Bramble, Joseph E. Pasciak, and Apostol T. Vassilev A Penalized Finite-Element Method for a Compressible Stokes System R. Bruce Kellogg and Biyue Liu Analysis of Moving Mesh Partial Differential Equations with Spatial Smoothing Weizhang Huang and Robert D. Russell Analysis of the Cell-Vertex Finite Volume Method for Hyperbolic Problems with Variable Coefficients Philippe Balland and Endre Suli An L1-Error Bound for a Semi-Implicit Difference Scheme Applied to a Stiff System of Conservation Laws Hans Joachim Schroll, Aslak Tveito, and Ragnar Winther Best Error Bounds for Odd and Even Degree Deficient Splines Francois Dubeau and Jean Savoie An ADI Method for Hysteretic Reaction-Diffusion Systems Chichia Chiu and Noel Walkington The Numerical Computation of Homoclinic Orbits for Maps W.-J. Beyn and J.-M. Kleinkauf Error Estimates with Sharp Constants for a Fading Memory Volterra Problem in Linear Solid Viscoelasticity S. Shaw, M. K. Warby, and J. R. Whiteman The Application of Eigenpair Stability to Block Diagonalization Nilotpal Ghosh, William W. Hager, and Purandar Sarmah Defining Functions for Multiple Hopf Bifurcations W. Govaerts, J. Guckenheimer, and A. Khibnik From: Edward Sisson, Production Editor ------------------------------ From: thomas@siam.org Subject: Contents, SIAM Journal of Control and Optimization Date: Mon, 19 May 97 SIAM Journal of Control and Optimization July 1997 Vol. 35, No. 4 Table of Contents Min-Max Characterization of a Small Noise Limit on Risk-Sensitive Control A. Bensoussan and H. Nagai Finite-Dimensional Filters with Nonlinear Drift VII: Mitter Conjecture and Structure of eta Jie Chen and Stephen S.-T. Yau Finite-Dimensional Filters with Nonlinear Drift VIII: Classification of Finite-Dimensional Estimation Algebras of Maximal Rank with State-Space Dimension 4 Jie Chen, Stephen S.-T. Yau, and Chi-Wah Leung Proximal Minimization Methods with Generalized Bregman Functions Krzysztof C. Kiwiel Turnpike Property of Optimal Solutions of Infinite-Horizon Variational Problems A. J. Zaslavski An Abstract Bang-Bang Principle and Time-Optimal Boundary Control of the Heat Equation Victor J. Mizel and Thomas I. Seidman H_Infinity Control and Estimation Problems with Delayed Measurements: State-Space Solutions Krishan M. Nagpal and R. Ravi Constrained H_Infinity Optimal Control over an Infinite Horizon Athanasios Sideris and Hector Rotstein Experimental Confirmation of a PDE-Based Approach to Design of Feedback Controls H. T. Banks, Ralph C. Smith, D. E. Brown, R. J. Silcox, and Vern L. Metcalf Pontryagin's Principle for State-Constrained Boundary Control Problems of Semilinear Parabolic Equations Eduardo Casas An Approximation Algorithm for Nonholonomic Systems Wensheng Liu Regularity Properties of the Phase for Multivariable Systems Kevin A. Grasse and Jonathan R. Bar-on A General Stochastic Outer Approximations Method Y. V. Volkov and S. K. Zavriev A Remark on Existence of Solutions of Infinite-Dimensional Noncompact Optimal Control Problems H. O. Fattorini Sequential Convex Subdifferential Calculus and Sequential Lagrange Multipliers Lionel Thibault From: Kelly Thomas, Production Editor, SIAM Journal on Control and Optimization ------------------------------ From: demoura@server02.lncc.br (Carlos Moura) Subject: Comp & Appl Math: Sp. Issue Stochastic Analysis I - contents Date: Tue, 13 May 1997 12:28:27 -0300 Computational and Applied Mathematics Vol.16, Issue 1, 1997 (Matematica Aplicada e Computacional) Table of Contents Jointly published by Birkhauser-Boston and SBMAC - Brazilian Soc. for Computational and Applied Mathematics Special Issue on Stochastic Analysis I Foreword MD Fragoso and OLV Costa (Guest Editors) The Unfolding of Dynamics in Stochastic Analysis L Arnold The Feynman-Kac Formula and Decomposition of Brownian Paths M Jeanblanc, J Pitman and M Yor Feller Semigroups and Markov Processes K Taira ------------------------------ From: Baltzer Science Subject: Advances in Computational Mathematics content list Date: Tue, 20 May 1997 09:32:04 +0200 Message-Id: <199705200732.JAA28577@ns.baltzer.nl> Advances in Computational Mathematics 1997 Volume 7, Number 3 Table of Contents The Petrov--Galerkin method for second kind integral equations II: multiwavelet scheme Zhongying Chen, Charles A. Micchelli and Yuesheng Xu Adaptive finite element for semi-linear convection--diffusion problems L. Pouly and J. Pousin Error analysis of mixed finite elements for cylindrical shells Geng Yang, Michel C. Delfour and Michel Fortin The compass (star) identity for vector-valued rational interpolants P.R. Graves-Morris and B. Beckermann Sensitivity analysis of the differential matrix Riccati equation based on the associated linear differential system Mihail Konstantinov and Vera Angelova A new theoretically motivated higher order upwind scheme on unstructured grids of simplices Monika Wiers Interior estimates for a low order finite element method for the Reissner--Mindlin plate model Douglas N. Arnold and Xiaobo Liu Stepsize selection for tolerance proportionality in explicit Runge--Kutta odes M. Calvo, D.J. Higham, J.I. Montijano and L. Rández Spectral properties of matrix continuous refinement operators Qingtang Jiang and S.L. Lee Orthogonality properties of linear combinations of orthogonal polynomials II Francisco Marcellan, Franz Peherstorfer and Robert Steinbauer More information on this journal: http://www.baltzer.nl/adcom/ Sincerely, Baltzer Science Publishers mailer@ns.baltzer.nl ------------------------------ From: Baltzer Science Subject: Numerical Algorithms content list Date: Tue, 20 May 1997 09:37:51 +0200 Numerical Algorithms 1997 Volume 14, Number 4 Table of Contents Immersed interface methods for moving interface problems Zhilin Li A class of two-stage iterative methods for systems of weakly nonlinear equations Zhong-Zhi Bai Rectangular matrix Pade approximants and square matrix orthogonal polynomials Andre Draux and Borhane Moalla Progressive stable interpolation Abdelmalek Nigro and Pierre-Jean Laurent Massively parallel preconditioners for symmetric positive definite linear systems Francois Alouges and Philippe Loreaux Stable evaluation of box-splines Leif Kobbelt Construction of conjugate quadrature filters with specified zeros Wayne Lawton and Charles A. Micchelli Book reviews More information on this journal: http://www.baltzer.nl/numa/ Sincerely, Baltzer Science Publishers mailer@ns.baltzer.nl ------------------------------ From: Secretary Support - Magrijn Subject: Journal MCSS Date: Tue, 27 May 1997 15:37:28 +-200 MCSS Volume 9, Number 4 Table of Contents Connections between stochastic control and dynamic games P. Dai Pra, L. Meneghini and W.J. Runggaldier How violent are fast controls? -II T.I. Seidman and Jiongmin Yong Finite-dimensional solutions of a modified Zakai-equation V.E. Benes and R.J. Elliott On the scalar rational interpolation problem P. Fitzpatrick Finite-dimensional filters with nonlinear drift VI: Linear structure on $\Omega$ Jie Chen and S.S.-T. Yau Complexity issues in robust stability of linear delay-differential systems O. Toker and H. Ozbay INFORMATION Information on MCSS including tables of contents is available at its home pages: http://www.cwi.nl/cwi/departments/BS3/mcss.html http://www.math.rutgers.edu/~sontag/mcss.html Address for submissions: J.H. van Schuppen (Co-Editor MCSS) CWI P.O.Box 94079 1090 Gb Amsterdam The Netherlands Bradley Dickinson, Eduardo Sontag, Jan van Schuppen (Editors) Contributed by Jan H. van Schuppen (J.H.van.Schuppen@cwi.nl) ------- end -------