AMS Sectional Meeting Full Program
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1991 Eastern Section Meeting
Philadelphia, PA, October 1213, 1991
Meeting #868
Associate secretaries:
W Wistar Comfort, AMS
wcomfort@wesleyan.edu
Saturday October 12, 1991

Saturday October 12, 1991, 7:30 a.m.9:55 a.m.
Special Session on Variational Problems in Low Dimensional Geometry, I

7:30 a.m.
Foliations of Euclidean 3space by constant mean curvature surfaces.
Wayne F. Rossman*, University of Massachusetts, Amherst
(86853175)

8:10 a.m.
Constant mean curvature hypersurfaces foliated by spheres.
William C. Jagy*, Midwestern State University
(8685379)

8:45 a.m.
Minimal surfaces and the squaredmeancurvature functional.
Nicholas Schmitt*, University of Massachusetts, Amherst
(8685389)

9:25 a.m.
Construction of genus two doublyperiodic embedded minimal surfaces in R^3.
Fusheng Wei*, University of Massachusetts, Amherst
(86853151)

Saturday October 12, 1991, 8:00 a.m.9:50 a.m.
Special Session on Recent Progress in Ricci Curvature and Related Topics, I

8:00 a.m.
Hyperbolic Cartan connections and the Ricci flow.
Maung Minoo*, McMaster University
(86853132)

8:40 a.m.
Nonnegative Ricci curvature and the fundamental group.
Detlef Gromoll*, State University of New York, Stony Brook
(86853185)

9:20 a.m.
Informal Discussion

Saturday October 12, 1991, 8:00 a.m.9:50 a.m.
Special Session on Modular Forms, Arithmetic Algebraic Geometry, I

8:00 a.m.
Application of Dedekind sums to invariants of modular equations.
Harvey Cohn*, City College, City University of New York
Marvin I. Knopp, Temple University
(8681152)

8:30 a.m.
Rational period functions with irrational poles are not Hecke eigenfunctions.
Ellen Gethner*, Ohio State University, Columbus
(86811137)

9:00 a.m.
Rational period functions, modular integrals, and indefinite binary quadratic forms.
L. Alayne Parson*, Ohio State University, Columbus
(86811136)

9:30 a.m.
Periods of modular forms.
Don Zagier*, MaxPlanck Institute for Mathematics, Germany
(86811147)

Saturday October 12, 1991, 8:00 a.m.9:50 a.m.
Special Session on Surgery Theory and Singular Spaces, I

8:00 a.m.
Formulae for generalized Casson's su(2)invariant of 3manifolds.
Sylvain Cappell, Courant Institute of Mathematical Sciences, New York University
Ronnie Lee*, Yale University
Edward Miller, Polytechnic Institute of New York
(86820138)

8:30 a.m.
Algebraic homotopy.
Justin R. Smith*, Drexel University
(86855159)

9:00 a.m.
Inductive detection for homotopy equivalences of manifolds.
Slawomir Kwasik*, Tulane University
Reinhard Schultz, Purdue University, West Lafayette
(8685778)

9:30 a.m.
Algebraic Gvector bundles.
Ted Petrie*, Rutgers University, New Brunswick
(8681475)

Saturday October 12, 1991, 8:00 a.m.9:50 a.m.
Special Session on Geometric Analysis, I

8:00 a.m.
Radon and Riesz transforms in real hyperbolic spaces.
Carlos A. Berenstein*, University of Maryland, College Park
Enrico Casadio Tarabusi, Universita di Trento, Povo, Italy
(8684409)

8:30 a.m.
Support properties of the spherical Radon transform.
Paul Goodey*, University of Oklahoma
Wolfgang Weil, Universit\"at Karlsruhe, Germany
(8685206)

9:00 a.m.
Microlocal analysis of the 2plane transform.
Allan Greenleaf*, University of Rochester
Gunther Uhlmann, University of Washington
(86858116)

9:30 a.m.
Explicit nonlocal formulas in real integral geometry.
Simon Gindikin*, Rutgers University, New Brunswick
(8684485)

Saturday October 12, 1991, 8:00 a.m.9:50 a.m.
Special Session on Extreme Value Theory, I

8:00 a.m.
Regularly varying expected residual life and the domain of attraction of exp(exp(x)).
Janos Galambos*, Temple University, Philadelphia
Yuan Xu, University of Texas, Austin
(8686069)

8:30 a.m.
Tail behaviour of quantile processes.
Mikl\'os Cs\"org\H o*, Carleton University
(8686097)

9:00 a.m.
Extremes of interarrival times under a variety of conditioning.
Abera Abay*, Temple University, Philadelphia
(8686045)

9:30 a.m.
Tail empirical and sums of extreme value processes.
David M. Mason*, University of Delaware
(86860121)

Saturday October 12, 1991, 8:00 a.m.9:50 a.m.
Special Session on Applications of Microlocal Analysis to Partial Differential Equations, I

8:00 a.m.
A nonsolvable complex vector field with Holder coefficients.
Howard Jacobowitz*, Institute for Advanced Study
(8683562)

8:35 a.m.
Local solvability and estimates for the tangential CauchyRiemann equations.
MeiChi Shaw*, University of Notre Dame
(86835123)

9:10 a.m.
On the integrability of firstorder complex PDE.
Francois Treves*, Rutgers University, New Brunswick
(86835162)

Saturday October 12, 1991, 8:00 a.m.9:50 a.m.
Special Session on Rings and Representations, I

8:00 a.m.
The Jacobi identity for vertex operators and the representations of the twisted parafermion algebra.
Cristiano Husu*, University of Connecticut, Stamford
(86817139)

8:30 a.m.
pstructure of the Moonshine modules.
Chongying Dong*, University of California, Santa Cruz
Geoffrey Mason, University of California, Santa Cruz
(8681754)

9:00 a.m.
Vertex operator algebras, modules and intertwining operators.
Alex J. Feingold*, State University of New York, Binghamton
John F. X. Ries, Ithaca College
(8681763)

9:30 a.m.
Isomorphic vertex operator algebras induced by global conformal transformations on annuli.
YiZhi Huang*, University of Pennsylvania
(8688150)

Saturday October 12, 1991, 8:00 a.m.9:50 a.m.
Special Session on Tilings, I

8:00 a.m.
Some unsolved tiling problems.
Doris Schattschneider*, Moravian College
(86851106)

8:30 a.m.
Periodic tiling and how to compute them.
D. H. Huson*, University of Bielefeld, Germany
(8685165)

9:00 a.m.
How do matching rules work?
Joshua E. S. Socolar*, IBM T. J. Watson Research Center, Yorktown Heights, New York
(86805109)

9:30 a.m.
Matching rules for quasiperiodic tilings: Topological approach.
Andr\'e Katz*, Ecole Polytechnique, France
Leonid S. Levitov, Institute for Theoretical Physics, USSR and Massachusetts Institute on Technology
(86852145)

Saturday October 12, 1991, 8:00 a.m.9:50 a.m.
Special Session on Phase Transitions and/or Front Propagation, I

8:00 a.m.
Mathematical existence of crystal growth with GibbsThomson curvature effects.
Fred Almgren*, Princeton University
Lihe Wang, Princeton University
(8684930)

8:30 a.m.
Surface energies and phase transitions.
Irene Fonseca*, Carnegie Mellon University
(8684980)

9:00 a.m.
Motion by crystalline curvature.
Jean Taylor*, Rutgers University, New Brunswick
(8684938)

9:30 a.m.
Elliptic regularization of motion by mean curvature.
Tom Ilmanen*, Institute for Advanced Study
(86851122)

Saturday October 12, 1991, 8:00 a.m.9:50 a.m.
Special Session on Numerical Linear Algebra, I

8:00 a.m.
A projection cutting plane algorithm for convex programming problems.
Mordukh E. Primak*, Temple University, Philadelphia
Daniel B. Szyld, Temple University, Philadelphia
(8686525)

8:30 a.m.
Parallel implementation of the hpversion of the finite element method on a sharedmemory architecture.
I. Babu\v ska, University of Maryland, College Park
H. C. Elman*, University of Maryland, College Park
K. Markley, Rice University
(8686517)

9:00 a.m.
Laplace's equation and the DirichletNeumann map in multiply connected domains.
A. Greenbaum*, Courant Institute of Mathematical Sciences, New York University
L. Greengard, Courant Institute of Mathematical Sciences, New York University
G. B. McFadden, National Institute of Standards and Technology, Maryland
(8686505)

9:30 a.m.
Some recent results on Schwarz type domain decomposition algorithms.
Olof B. Widlund*, Courant Institute of Mathematical Sciences, New York University
(8686510)

Saturday October 12, 1991, 10:00 a.m.11:00 a.m.
Invited Address
Phase transitions and front propagation.
ROOM 501, Temple University Center City, 1619 Walnut Street
Panagiotis E. Souganidis*, Brown University
(86835153)

Saturday October 12, 1991, 12:30 p.m.1:30 p.m.
Invited Address
Hyperbolization and metrics of least curvature on 3manifolds.
ROOM 501, Temple University Center City, 1619 Walnut Street
Michael T. Anderson*, State University of New York, Stony Brook
(86858101)

Saturday October 12, 1991, 1:45 p.m.3:35 p.m.
Special Session on Recent Progress in Ricci Curvature and Related Topics,II

1:45 p.m.
Multiplier ideal sheaves and Futaki's invariant.
Alan M. Nadel*, Massachusetts Institute of Technology
(8685346)

2:25 p.m.
On the topological growth of metric balls in a complete manifold with nonnegative Ricci curvature.
Zhongmin Shen*, University of Michigan, Ann Arbor
(8685392)

3:05 p.m.
Aspects of prescribing Ricci curvature.
Dennis DeTurck*, University of Pennsylvania
(86853114)

Saturday October 12, 1991, 1:45 p.m.4:05 p.m.
Special Session on Modular Forms, Arithmetic Algebraic Geometry, II

1:45 p.m.
New bounds for exponential sums and a conjecture of MacWilliams and Sloane.
Carlos J. Moreno*, Bernard M. Baruch College, City University of New York
Oscar Moreno, University of Puerto Rico, Rio Piedras, Puerto Rico
(86811129)

2:15 p.m.
A halfintegral weight multiplicityone theorem.
Thomas R. Shemanske*, Dartmouth College
Lynne H. Walling, University of Colorado, Boulder
(86811104)

2:45 p.m.
Numbertheoretic constructions of Ramanujan graphs.
WenChing Winnie Li*, Pennsylvania State University, University Park
(86811124)

3:15 p.m.
Problem Session

Saturday October 12, 1991, 1:45 p.m.4:05 p.m.
Special Session on Surgery Theory and Singular Spaces, II

1:45 p.m.
Quantum invariants of lens spaces and a Dehn surgery formula.
Robion Kirby, University of California, Berkeley
Paul Melvin*, Bryn Mawr College
(86857156)

2:15 p.m.
Ltheory and dihedral homology. II.
Guillermo Corti\~nas*, Rutgers University, New Brunswick
(86819133)

2:45 p.m.
On the UNil group of Cappell.
Frank Connolly*, University of Notre Dame
Tadeusz Kozniewski, University of Warsaw, Poland
(86857157)

3:15 p.m.
Bounded surgery and nonlinear similarity.
Ian Hambleton*, McMaster University
E. K. Pedersen, State University of New York, Binghamton
(8685791)

3:45 p.m.
Cocompact actions on S^n x R^k.
Erik Kjaer Pedersen*, State University of New York, Binghamton
(86857108)

Saturday October 12, 1991, 1:45 p.m.4:05 p.m.
Special Session on Geometric Analysis, II

1:45 p.m.
On Blaschke's affine surface area formula.
Erwin Lutwak*, Polytechnic Institute of New York
(86844110)

2:15 p.m.
Discrepancy of halfspaces.
Ralph Alexander*, University of Illinois, UrbanaChampaign
(86852125)

2:45 p.m.
Wavelets and selfaffine tilings.
Robert S. Strichartz*, Cornell University
(86841115)

3:15 p.m.
A vanishing theorem for distributions and support theorems for Radon transforms.
Jan Boman*, University of Stockholm, Sweden
(8684488)

3:45 p.m.
Cohomology relative to the germ of an exact analytic form.
Abdelhamid Meziani*, Florida International University
(86844150)

Saturday October 12, 1991, 1:45 p.m.3:35 p.m.
Special Session on Extreme Value Theory, II

1:45 p.m.
Bounding probabilities connected with multiple event sequences.
Andras Prekopa*, Rutgers University, New Brunswick
(86860128)

2:15 p.m.
Bivariate Bonferronitype inequalities.
MinYoung Lee*, DanKook University, Korea
(8686044)

2:45 p.m.
Distribution functions related to the largest prime factor function.
Jean Marie DeKoninck*, Universit\'e Laval
(86811107)

3:15 p.m.
Informal Discussion

Saturday October 12, 1991, 1:45 p.m.4:00 p.m.
Special Session on Applications of Microlocal Analysis to Partial Differential Equations, II

1:45 p.m.
Applications of microlocal analysis to partial differential equations.
J. J. Kohn*, Princeton University
(86835144)

2:20 p.m.
Convex domains of finite type.
Jeffery D. McNeal*, Princeton University
(86835160)

2:55 p.m.
Microlocal analytic hypoellipicity for box_b.
David S. Tartakoff*, University of Illinois, Chicago
Makhlouf Derridj, University of ParisSud, France
(86835161)

3:30 p.m.
Global analytic hypoellipticity of the barred partialNeumann problem on decoupled Hartogs domains in dimension two.
SoChin Chen*, State University of New York, Albany
(8683271)

Saturday October 12, 1991, 1:45 p.m.4:15 p.m.
Special Session on Variational Problems in Low Dimensional Geometry, II

1:45 p.m.
Complete embedded minimal surfaces of finite total curvature with three ends.
David Hoffman*, University of Massachusetts, Amherst
(86853173)

2:25 p.m.
Harmonic immersions of surfaces into hyperbolic 3manifolds.
Michael Wolf*, Rice University
(86858142)

3:05 p.m.
Volume minimization of Lagrangian submanifolds under Hamiltonian deformations.
YongGeun Oh*, Courant Institute of Mathematical Sciences, New York University
(8685370)

3:45 p.m.
Nonuniqueness and high energy solutions for the Yamabe problem.
Daniel Pollack*, Stanford University
(8683532)

Saturday October 12, 1991, 1:45 p.m.3:35 p.m.
Special Session on Rings and Representations, II

1:45 p.m.
Lie bialgebra structures for the Witt algebra, the Virasoro algebra, Vect (S^1), and their dual Lie coalgebras.
Walter J. Michaelis*, University of New Orleans
(86817165)

2:15 p.m.
Witt and Virasoro algebras as Lie bialgebras.
Earl J. Taft*, Rutgers University, New Brunswick and Mathematical Sciences Research Institute, Berkeley
(8681719)

2:45 p.m.
Degree lowering algorithm and applications to the Weyl algebra.
C. A. Dean*, University of Michigan, Ann Arbor
J. W. Kerr, Michigan State University
(86816187)

3:15 p.m.
On fully invariant ideals of the free group algebra and the free associative algebra.
Samuel M. Vovsi*, Rutgers University, New Brunswick
(86816140)

Saturday October 12, 1991, 1:45 p.m.4:05 p.m.
Special Session on Tilings, II

1:45 p.m.
Golden isozonohedra, indiscrete regular tessellations, and quasicrystals.
H. S. M. Coxeter*, University of Toronto
(8685143)

2:15 p.m.
Regular maps constructed from linear groups.
Peter McMullen, University College of London, England
Barry Monson, University of New Brunswick
Asia Ivi\'c Weiss*, York University
(8685176)

2:45 p.m.
Monotypic tilings.
Egon Schulte*, Northeastern University
(8685277)

3:15 p.m.
Selfsimilar tiles with one tile.
Karlheinz Grochenig*, University of Connecticut, Storrs
(8685267)

3:45 p.m.
Matching conditions for, and minor modifications of, the 2tile rhomboid set in 3space.
Robert Ammann*, Billerica, Massachusetts
(86852181)

Saturday October 12, 1991, 1:45 p.m.4:05 p.m.
Special Session on Phase Transitions and/or Front Propagation, II

1:45 p.m.
Dynamical issues for the CahnHilliard equation.
Paul C. Fife*, University of Utah
(8683555)

2:15 p.m.
Dynamics of the CahnHilliard equation.
Peter W. Bates*, Brigham Young University
(8683534)

2:45 p.m.
Slow dynamics of spherical fronts for the CahnHilliard equation.
N. D. Alikakos, University of Tennessee, Knoxville
G. Fusco*, University of Rome, Italy
(86835119)

3:15 p.m.
Slow evolution for the CahnHilliard equation revisited.
Lia Bronsard*, Carnegie Mellon University
Danielle Hilhorst, University of Paris, France
(8683536)

3:45 p.m.
On the spectrum of the CahnHilliard operator.
Nicholas D. Alikakos*, University of Tennessee, Knoxsville and University of Crete, Greece
Giorgio Fusco, University of Rome, Italy
(86835143)

Saturday October 12, 1991, 1:45 p.m.4:05 a.m.
Special Session on Numerical Linear Algebra, II

1:45 p.m.
On the convex hull of projection matrices.
Michael L. Overton*, Courant Institute of Mathematical Sciences, New York University
Robert S. Womersley, University of New South Wales, Australia
(8686514)

2:15 p.m.
Joint stability of two matrices and their joint spectral radius.
Gilbert Strang*, Massachusetts Institute of Technology
(8686507)

2:45 p.m.
Eigenvalues and pseudoeigenvalues of nonsymmetric random matrices.
Lloyd N. Trefethen*, Cornell University
(8686520)

3:15 p.m.
Updatable, rankrevealing decompositions.
G. W. Stewart*, University of Maryland, College Park
(8686501)

3:45 p.m.
Numerical computation of an analytic, singular value decomposition of a matrix valued function.
Angelika BunseGerstner, University of Bielefeld, Germany
Ralph Byers*, University of Kansas
Volker Mehrmann, University of Bielefeld, Germany
Nancy K. Nichols, University of Reading, United Kingdom
(8686503)

Saturday October 12, 1991, 1:45 p.m.4:25 p.m.
Session on Analysis

1:45 p.m.
A relation between the Jacobian and the elementary generalized Wronskians.
Kenneth Wolsson*, Fairleigh Dickinson University
(8682653)

2:00 p.m.
Zeros of the successive derivatives of power series with Hadamard gaps.
Robert Gethner*, Franklin & Marshall College
(8683004)

2:15 p.m.
Initial value problems and Green's functions for Leveroni wave operators.
Steven D. Bronson*, Boston University
WingTsin Ma, Boston University
Raymond J. Nagem, Boston University
(86839182)

2:30 p.m.
Nondispersive and isotropic wave operators for a lattice.
Susan Leveroni*, Boston University
Guido v. H. Sandri, Boston University
(86839183)

2:45 p.m.
Quantum wavelets: The Dirac variational principle.
D. F. Hsu*, Boston University
D. Coker, Boston University
G. v. H. Sandri, Boston University
(86841190)

3:00 p.m.
New methods for solving Fredholm integral equations.
Thomas W. Drueding*, Boston University
Guido v. H. Sandri, Boston University
Y. M. Fleming Lure, Caelum Research Corporation, Maryland
H. Y. Michael Yeh, Caelum Research Corporation, Maryland
(86845188)

3:15 p.m.
Construction of a convolution algebra.
Brahm A. Rhodes*, Harvard Medical School
Thomas W. Drueding, Boston University
(86813189)

3:30 p.m.
A random number generator based on the logistic equation.
J. J. Collins, Boston University
Guido v. H. Sandri*, Boston University
(86860180)

3:45 p.m.
Rigorous solutions for elastic wave scattering.
Mark K. Hinders*, Massachusetts Institute of Technology
TaMing Fang, Massachusetts Institute of Technology
(86873184)

4:00 p.m.
Some numerical integration methods using Taylor polynominals.
Alan Horwitz*, Pennsylvania State University, Media
(86865127)

4:15 p.m.
Exploring Hermite interpolation with mathematica.
Clifford A. Reiter*, Lafayette College
(8686557)

Saturday October 12, 1991, 1:45 p.m.3:40 p.m.
Session on Algebra and Geometry

1:45 p.m.
A note on computing eigenvalues of banded Hermitian Toeplitz matrices.
William F. Trench*, Trinity University
(8681596)

2:00 p.m.
Boolean lattices of function spaces on direct products of groups with zeros.
Hassan Sedaghat*, Virginia Commonwealth University
(8682283)

2:15 p.m.
Construction of a universal point for aperiodic tilings.
Catherine Gorini*, Maharishi International University
(8685166)

2:30 p.m.
The valance and coloring problems.
Jonathan Sondow*, Yeshiva University
(8685282)

2:45 p.m.
Families of nearly neighborly rectangular polytopes.
Julie D. Simon*, Antioch College
(86852168)

3:00 p.m.
Tiling by stacks.
Linda Fosnaugh*, Emporia State University
David Klarner, University of Nebraska, Lincoln
(86805131)

3:15 p.m.
Inverse problems in design theory.
Vadim Komkov*, Air Force Institute of Technology
(86873135)

3:30 p.m.
The Selberg conjecture for SL(3,Z).
Jonathan Huntley*, Bernard M. Baruch College, City University of New York
David E. Tepper, Bernard M. Baruch College, City University of New York
(8681158)
Sunday October 13, 1991

Sunday October 13, 1991, 7:30 a.m.9:50 a.m.
Special Session on Modular Forms, Arithmetic Algebraic Geometry, III

7:30 a.m.
Galois module structure of schemes and modular forms.
Ted Chinburg*, University of Pennsylvania
(8681195)

8:00 a.m.
Torsion points on some Jacobians of modular curves.
Dino J. Lorenzini*, Duke University
(8681193)

8:30 a.m.
pAdic complex power and BernsteinSato polynominal.
XiaoWei Zhu*, University of Oklahoma
(86811166)

9:00 a.m.
Variation of the canonical height in algebraic families.
Joseph Silverman*, Brown University
(8681129)

9:30 a.m.
Informal Discussion

Sunday October 13, 1991, 7:30 a.m.9:50 a.m.
Special Session on Surgery Theory and Singular Spaces, III

7:30 a.m.
Noncharacteristic embeddings of Tori.
David Miller*, Swarthmore College
(8685761)

8:00 a.m.
Positive scalar curvature for closed manifolds with finite fundamental group.
Jonathan Rosenberg*, University of Maryland, College Park
(86853158)

8:30 a.m.
Characteristics class and singular spaces.
Sylvain Cappell*, Courant Institute of Mathematical Sciences, New York University
(86857176)

9:00 a.m.
Atiyah invariant of Kahler manifolds and Picard variety.
A. Libgober*, University of Illinois, Chicago
(86857126)

9:30 a.m.
Torsion and the Ktheory of Von Neumann algebras.
Mel Rothenberg*, University of Chicago
(8685787)

Sunday October 13, 1991, 7:30 a.m.9:50 a.m.
Special Session on Geometric Analysis, III

7:30 a.m.
The flat horocycle transform on a symmetric space.
Sigurdur Helgason*, Massachusetts Institute of Technology
(8684323)

8:00 a.m.
The infinitesimal rigidity of the complex quadric of dimension four.
Hubert Goldschmidt*, Columbia University
(8685324)

8:30 a.m.
Range characterizations of totally geodesic Radon transforms on compact symmetric spaces.
Fulton Gonzalez*, Tufts University
(8684486)

9:00 a.m.
Radon transforms and structure of compact symmetric spaces.
Eric Grinberg*, Temple University, Philadelphia
(86844149)

9:30 a.m.
Real analytic Radon transforms and Pompeiu problems.
Eric Todd Quinto*, Tufts University
(8684490)

Sunday October 13, 1991, 7:30 a.m.9:55 a.m.
Special Session on Variational Problems in Low Dimensional Geometry, III

7:30 a.m.
Poincare's geodesics, soap bubbles, and constantcurvature curves.
Frank Morgan*, Williams College
(86853113)

8:10 a.m.
What is (weighted) mean curvature?
Jean Taylor*, Rutgers University, New Brunswick
(8684937)

8:45 a.m.
Computing optimal geometries.
Fred Almgren*, Princeton University
(8684931)

9:25 a.m.
Proving areaminimization by slicing.
Gary R. Lawlor*, Brigham Young University
(8684942)

Sunday October 13, 1991, 7:30 a.m.9:50 a.m.
Special Session on Phase Transitions and/or Front Propagation, III

7:30 a.m.
Generalized mean curvature motion.
L. C. Evans*, University of California, Berkeley
J. Spruck, University of Massachusetts, Amherst
(8683574)

8:00 a.m.
Front propogation for reaction diffusion equations.
G. Barles*, University de Tours, France
H. M. Soner, Carnegie Mellon University
P. E. Souganidis, Brown University
(8683533)

8:30 a.m.
Curvaturedependent front propagation with boundary conditions.
Peter Sternberg*, Indiana University, Bloomington
(8683573)

9:00 a.m.
Convergence of AllenCahn equation.
H. Mete Soner*, Carnegie Mellon University
(8683581)

9:30 a.m.
Models of flame propagation and crystal growth: A differential games approach.
Pierpaolo Soravia*, Brown University
(86835163)

Sunday October 13, 1991, 7:30 a.m.9:50 a.m.
Special Session on Numerical Linear Algebra, III

7:30 a.m.
A direct method for solving unstructed sparse linear systems.
Carl D. Meyer*, North Carolina State University
(8686522)

8:00 a.m.
A new implementation of th GMRES method.
Lothar Reichel*, University of Kentucky
Z. Bai, University of Kentucky
D. Hu, University of Kentucky
(8686508)

8:30 a.m.
Asynchronous parallel iterations for solving nonlinear systems.
L. Elsner, University of Bielefeld, Germany
I. Koltracht, University of Connecticut, Storrs
M. Neumann*, University of Connecticut, Storrs
(8686535)

9:00 a.m.
SOR for Markov chain problems.
William J. Stewart*, North Carolina State University
(8686599)

9:30 a.m.
Convergent iterative methods to find stationary distributions of Markov processes.
Ivo Marek*, University Karlovy, Czechoslovakia
Daniel B. Szyld, Temple University, Philadelphia
(8686526)

Sunday October 13, 1991, 8:00 a.m.9:50 a.m.
Special Session on Recent Progress in Ricci Curvature and Related Topics,III

8:00 a.m.
Diffeomorphism finiteness for a certain class of Riemannian manifolds.
Jeff Cheeger*, Courant Institute of Mathematical Sciences, New York University
(8685372)

8:40 a.m.
Volume comparison under scaling invariant Ricci bound.
Guojun G. Liao*, University of Texas, Arlington
Jianzhong Su, University of Texas, Arlington
(8685351)

9:20 a.m.
Bounds on the fundamental group of a manifold with almost nonnegative Ricci curvature.
Steve Rosenberg, Boston University
Deane Yang*, Polytechnic Institute of New York
(86853103)

Sunday October 13, 1991, 8:00 a.m.9:50 a.m.
Special Session on Extreme Value Theory, III

8:00 a.m.
Improved asymtotics for tail density estimation.
James Pickands, III*, University of Pennsylvania
(86862152)

8:30 a.m.
A flaw model with random intensity.
Howard M. Taylor*, University of Delaware
(86860118)

9:00 a.m.
Practical application of newer methods of tail estimation to wind engineering: A case study.
James A. Lechner, National Institute of Standards and Technology, Maryland
Stefan D. Leigh*, National Institute of Standards and Technology, Maryland
Emil Simiu, National Institute of Standards and Technology, Maryland
(86862112)

9:30 a.m.
Extreme values in stochastic epidemic processes.
Grace L. Yang*, University of Maryland, College Park
(86860130)

Sunday October 13, 1991, 8:00 a.m.9:40 a.m.
Special Session on Applications of Microlocal Analysis to Partial Differential Equations, III

8:00 a.m.
Analytic hypoellipticity of the Kohn Laplacian plus a constant.
Daryl Geller*, State University of New York, Stony Brook
(8683584)

8:35 a.m.
Boundedness of the FBI transform on Sobolev spaces and propagation of singularities.
S. Berhanu, Temple University, Philadelphia
S. Chanillo*, Rutgers University, New Brunswick
(86835117)

9:10 a.m.
Wedge extendability for hypoanalytic structures.
Mark E. Marson*, Purdue University, West Lafayette
(86835171)

Sunday October 13, 1991, 8:00 a.m.9:50 a.m.
Special Session on Rings and Representations, III

8:00 a.m.
Quotients of crossed products of Hopf algebras.
J. Bergen, DePaul University
M. Susan Montgomery*, University of Southern California
(86816154)

8:30 a.m.
Delta methods in enveloping rings. II.
Jeffrey Bergen*, DePaul University
D. S. Passman, University of Wisconsin, Madison
(8681627)

9:00 a.m.
Cocommutative Hopf algebra actions and the Connes spectrum.
James Osterburg, University of Cincinnati
Declan Quinn*, Syracuse University
(86816155)

9:30 a.m.
Artinian rings with linearly ordered twosided ideals.
Barbara L. Osofsky*, Rutgers University, New Brunswick
Richard D. Resco, University of Oklahoma
(8681694)

Sunday October 13, 1991, 8:00 a.m.9:50 a.m.
Special Session on Tilings, III

8:00 a.m.
Penrose tilings, crystals and dynamical systems.
Charles Radin*, University of Texas, Austin
(8684739)

8:30 a.m.
Tilings, orbifolds, and symmetry.
John H. Conway*, Princeton University
(86851105)

9:00 a.m.
An elementary proof of two triangletiling theorems of Conway and Lagarias.
Donald C. West*, State University of New York, College at Plattsburgh
(8680560)

9:30 a.m.
Classification of selfdual tilings.
Walter Stromquist*, Daniel H. Wagner Associates, Paoli, Pennsylvania
(8685168)

Sunday October 13, 1991, 8:30 a.m.9:50 a.m.
Special Session on Nonlinear Partial Differential Equations, I

8:30 a.m.
Solvability of a fourth order equation in conformal geometry.
SunYung Alice Chang*, University of California, Los Angeles
Paul C. Yang, University of Southern California
(8685312)

9:00 a.m.
On uniformly rotating stars.
Yanyan Li*, Rutgers University, New Brunswick
(8683516)

9:30 a.m.
PoincareBendixson theory for state dependent differentialdelay equations.
John MalletParet, Brown University
Roger D. Nussbaum*, Rutgers University, New Brunswick
(8683518)

Sunday October 13, 1991, 10:00 a.m.11:00 a.m.
Invited Address
Tilings, quasicrystals, and Hilbert's 18th problem.
ROOM 501, Temple University Center City, 1619 Walnut Street
Marjorie Senechal*, Smith College
(86852102)

Sunday October 13, 1991, 12:30 p.m.1:30 p.m.
Invited Address
Critical points at infinity in some variational problems.
ROOM 501, Temple University Center City, 1619 Walnut Street
Abbas Bahri*, Rutgers University, New Brunswick
(8683521)

Sunday October 13, 1991, 1:45 p.m.2:55 p.m.
Special Session on Recent Progress in Ricci Curvature and Related Topics,IV

1:45 p.m.
Manifolds of negatively pinched curvature.
Rugang Ye*, University of California, Santa Barbara
(86853186)

2:25 p.m.
Fredholm operators and Einstein metrics on conformally compact manifolds.
John M. Lee*, University of Washington
(86853164)

Sunday October 13, 1991, 1:45 p.m.4:05 p.m.
Special Session on Modular Forms, Arithmetic Algebraic Geometry, IV

1:45 p.m.
Zeta functions of flag varieties and Einstein series for Gl_n.
David J. Wright*, Oklahoma State University, Stillwater
(86811169)

2:15 p.m.
Eisenstein series with explicit expansions.
Paul Feit*, Hamden, Connecticut
(8681148)

2:45 p.m.
Universal local zeta functions.
Diane Meuser*, Boston University
(8681164)

3:15 p.m.
Bernoulli congruences between periods of modular forms.
G. S. Nelson*, Pennsylvania State University, Erie
(8681128)

3:45 p.m.
Informal Discusison

Sunday October 13, 1991, 1:45 p.m.3:35 p.m.
Special Session on Surgery Theory and Singular Spaces, IV

1:45 p.m.
Links and localised Blanchfield pairings.
Kent Orr*, Indiana University, Bloomington
(86857167)

2:15 p.m.
Gsurgery up to topological simple homotopy.
Mark Steinberger*, State University of New York, Albany
Frank Connolly, University of Notre Dame
(86857178)

2:45 p.m.
The equivariant Borel conjecture fails.
Shmuel Weinberger*, University of Chicago
(86857170)

3:15 p.m.
Periodicity in stable equivariant surgery.
Min Yan*, University of Michigan, Ann Arbor
(86857134)

Sunday October 13, 1991, 1:45 p.m.3:35 p.m.
Special Session on Geometric Analysis, IV

1:45 p.m.
Asymptotic finite propagation speed for heat diffusion on certain Riemannian manifolds.
JeanPhilippe Anker, Universite de Nancy I, France
Alberto G. Setti*, Cornell University
(8685841)

2:15 p.m.
Some direct and inverse problems arising in design of reflecting surfaces.
Vladimir Oliker*, Emory University
(8685340)

2:45 p.m.
Nonlinear Fourier analysis.
Leon Ehrenpreis*, Temple University, Philadelphia
(86844148)

3:15 p.m.
On stability estimates in the 'hole theorem'for the Radon transform.
Peter Kuchment*, Wichita State University
Ziqi Sun, Wichita State University
(86844172)

Sunday October 13, 1991, 1:45 p.m.3:35 p.m.
Special Session on Variational Problems in Low Dimensional Geometry, IV

1:45 p.m.
Projective minimal surfaces.
Lucas Hsu*, Mathematical Sciences Research Institute, Berkeley
(86858177)

2:25 p.m.
Variational properties of holomorphic Abelian differentials on Riemann surfaces.
Lev Slutskin*, Yeshiva University
(8683056)

3:05 p.m.
Isoperimetric regions in some product manifolds.
Jesus Gonzalo*, Universidad Autonoma de Madrid, Spain
(8685398)

Sunday October 13, 1991, 1:45 p.m.3:05 p.m.
Special Session on Tilings, IV

1:45 p.m.
Some results on semiregular tessellations of the hyperbolic plane.
Douglas J. Dunham*, University of Minnesota, Duluth
(86852146)

2:15 p.m.
Balance of tilings in the hyperbolic plane.
Judith Flagg Moran*, Trinity College
(86805100)

2:45 p.m.
Cube tilings, graphs, and simulation.
S\'andor Szab\'o*, University of the Pacific
(86851120)

Sunday October 13, 1991, 1:45 p.m.3:05 a.m.
Special Session on Phase Transitions and/or Front Propagation, IV

1:45 p.m.
Singular limits of phase field equations: Stefantype models, and motion by mean curvature.
G. Caginalp*, University of Pittsburgh
(8683559)

2:15 p.m.
Generation and propagation of interfaces for reactiondiffusion equations and systems.
Xinfu Chen*, University of Minnesota, Minneapolis
(8683511)

2:45 p.m.
Delayed oscillation phenomena.
Jianzhong Su*, University of Texas, Arlington
(8683549)

Sunday October 13, 1991, 1:45 p.m.3:05 p.m.
Special Session on Numerical Linear Algebra, IV

1:45 p.m.
Modifying the ShougenShuquin algorithm for the banded symmetric generalized matrix eigenvalue problem.
Linda Kaufman*, AT&T Bell Laboratories, Murray Hill, New Jersey
(8686513)

2:15 p.m.
Parallel solution of generalized band symmetric eigenvalue problems by sectioning.
Ricardo D. Pantazis*, Duke University
(86865111)

2:45 p.m.
Error analysis of update methods for the symmetric eigenvalue problem.
Jesse L. Barlow*, Pennsylvania State University, University Park
(8686502)

Sunday October 13, 1991, 1:45 p.m.3:05 p.m.
Special Session on Nonlinear Partial Differential Equations, II

1:45 p.m.
Multivortices in the electroweak theory.
Yisong Yang*, University of New Mexico
(8683547)

2:15 p.m.
Positive solutions of semilinear elliptic equationcap delta u + hu_n2/n+2 = 0.
Tiancheng Ouyang*, University of Cincinnati
(86835141)

2:45 p.m.
Generalized unique continuation theorems.
Libin Mou*, University of Southern California
(86835179)
Inquiries: meet@ams.org