AMS Sectional Meeting Program by Day
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1990 Fall Eastern Sectional Meeting
Amherst, MA, October 2021, 1990
Meeting #860
Associate secretaries:
W Wistar Comfort, AMS
wcomfort@wesleyan.edu
Saturday October 20, 1990

Saturday October 20, 1990, 7:50 a.m.9:45 a.m.
Session on Applied Mathematics
Room 51, Goessmann Laboratory

7:50 a.m.
Remarks on Volterra functionaldifferential equations.
C. Corduneanu*, University of Texas, Arlington
(86034126)

8:05 a.m.
Closure of the semigroup of convolutions.
C. Konstantopoulos, Boston University
W. Ma, Boston University
G. Sandri*, Boston University
(86046130)

8:20 a.m.
Electron electrodynamics.
Domina Eberle Spencer*, University of Connecticut, Storrs
Shama Y. Uma, Bridgewater State College
(8607889)

8:35 a.m.
Comparison of electric and magnetic field vectors in classical and Gaussian electrodynamics.
Domina Eberle Spencer, University of Connecticut, Storrs
Shama Y. Uma*, Bridgewater State College
(8607890)

8:50 a.m.
The differential equations of magnetohydrodynamics.
Gerard Coutu*, Hartford Graduate Center
Domina Eberle Spencer, University of Connecticut, Storrs
(8607691)

9:05 a.m.
The complete Maxwell equations.
Arjan S. Mirchandaney, Defiance College
Domina Eberle Spencer, University of Connecticut, Storrs
Shama Y. Uma, Bridgewater State College
Philip J. Mann*, University of Connecticut, Storrs
(8607892)

9:20 a.m.
Linear programming and toral actions.
Leonid Faybusovich*, Harvard University
(86090104)

9:35 a.m.
Characterization of an fdistance property for 1dimensional dsymbol quasicrystals.
Ramin Vakilian*, University of California, Davis
(86082124)

Saturday October 20, 1990, 8:00 a.m.9:50 a.m.
Special Session on Hyperbolic Manifolds, I
Room 20, Goessmann Laboratory

8:00 a.m.
The orthogonal spectrum of a hyperbolic manifold.
Ara Basmajian*, University of Oklahoma
(86053110)

8:30 a.m.
Geometrically tame hyperbolic 3manifolds.
Dick Canary*, Stanford University
(86057123)

9:00 a.m.
The smallest hyperbolic 3manifolds with totally geodesic boundary.
Sadayoshi Kojima*, Tokyo Institute of Technology, Japan
Yosuke Miyamoto, Tokyo Institute of Technology, Japan
(8602049)

9:30 a.m.
Amalgamation and the invariant trace field of a Kleinian group.
Walter D. Neumann*, Ohio State University, Columbus
Alan W. Reid, Ohio State University, Columbus and University of Aberdeen, Scotland
(8605750)

Saturday October 20, 1990, 8:00 a.m.9:50 a.m.
Special Session on Lattices, Geometry, and Combinatorics, I
Room 103, Lederle Graduate Research Center

8:00 a.m.
The adjunction argument.
Frank Grosshans*, West Chester University of Pennsylvania
(8605160)

8:30 a.m.
Lattice geometries.
M. K. Bennett, University of Massachusetts, Amherst
Robert Piziak*, Baylor University
(8600674)

9:00 a.m.
Formally real ^*fields.
Samuel S. Holland, Jr.*, University of Massachusetts, Amherst
(8600655)

9:30 a.m.
A Boolean formalization of the predicate calculus.
Isidore Fleischer*, University of Windsor
(8600357)

Saturday October 20, 1990, 8:00 a.m.9:50 a.m.
Special Session on Nonlinear Dynamics in Mathematics and Science, I
Room 126, Hasbrouck Laboratory

8:00 a.m.
Meromorphic nonlinear integrable systems.
Solomon J. Alber*, University of Pennsylvania
(86035117)

8:30 a.m.
Transient solutions of the NavierStokes equations.
D. Sather*, University of Colorado, Boulder
(8607611)

9:00 a.m.
Calculus of variations and Besicovitch dynamics.
M. S. Berger, University of Massachusetts, Amherst
Y. Y. Chen*, Princeton University
(86034113)

9:30 a.m.
Properties of travelling waves in a suspension bridge.
A. C. Lazer, University of Miami
P. J. McKenna*, University of Connecticut, Storrs
(86035111)

Saturday October 20, 1990, 8:00 a.m.9:50 a.m.
Special Session on Semigroups, I
Room 111, Lederle Graduate Research Center

8:00 a.m.
The congruence extension property, I.
John A. Hildebrant*, Louisiana State University, Baton Rouge
Josefa I. Garcia, University of Puerto Rico, Arecibo
(8602066)

8:30 a.m.
The congruence extension property, II.
Josefa I. Garcia*, University of Puerto Rico, Arecibo
John A. Hildebrant, Louisiana State University, Baton Rouge
(8602065)

9:00 a.m.
Difference semigroups.
Boris M. Schein*, University of Arkansas, Fayetteville
(8602062)

9:30 a.m.
Discussion

Saturday October 20, 1990, 8:00 a.m.9:50 a.m.
Special Session on Discrete Groups and Geometric Structures in 2, 3 and 4 Dimensions, I
Room 64, Goessmann Laboratory

8:00 a.m.
Mixing elements into Kleinian groups.
James Anderson*, State University of New York, Stony Brook
(86030100)

8:30 a.m.
Spectral geometry of arithmetic hyperbolic manifolds.
Robert Brooks*, University of Southern California
(8605827)

9:00 a.m.
Discussion

9:30 a.m.
Hausdorff dimensions of limit sets.
Kevin Corlette*, University of Chicago
(86053122)

Saturday October 20, 1990, 8:00 a.m.9:50 a.m.
Special Session on Lie Groups and Algebraic Groups, I
Room 201, Lederle Graduate Research Center

8:00 a.m.
Special unipotent representations.
Jeffrey Adams, University of Maryland, College Park
Dan Barbasch, Cornell University
David A. Vogan, Jr.*, Massachusetts Institute of Technology
(8602220)

8:30 a.m.
Lefschetz numbers and cyclic base change for purely imaginary extensions.
Birgit Speh*, Cornell University
(8601176)

9:00 a.m.
On Dixmier algebras.
Iwan Pranata*, Cornell University
(8601716)

9:30 a.m.
Szego mappings into representations in cohomology.
Leticia Barchini, State University of New York, Stony Brook
A. W. Knapp*, State University of New York, Stony Brook
(8602206)

Saturday October 20, 1990, 8:00 a.m.9:50 a.m.
Special Session on Algebraic Graph Theory, I
Room 101, Lederle Graduate Research Center

8:00 a.m.
Chordal graphs and matrix structure: A survey.
Charles R. Johnson*, College of William and Mary
(8601594)

8:40 a.m.
Graphs with given group, order, and size.
Louis V. Quintas*, Pace University, New York
(8600503)

9:20 a.m.
On binary trees and Spairs.
Chjan Lim*, Rensselaer Polytechnic Institute
(86005119)

Saturday October 20, 1990, 8:00 a.m.9:50 a.m.
Special Session on Ergodic Theory, I
Room 203, Lederle Graduate Research Center

8:00 a.m.
Some rigorous results for the GreenbergHastings model.
Richard Durrett, Cornell University
Jeffrey Steif*, Cornell University
(8606079)

8:30 a.m.
Invariants for shift equivalence of matrices of polynomials.
David Handelman*, University of Ottawa
(8602871)

9:00 a.m.
A characterization of ergodic dissipative flow.
Yuji Ito*, Keio University, Japan
(8602847)

9:30 a.m.
Discussion

Saturday October 20, 1990, 8:30 a.m.9:50 a.m.
Special Session on Aperiodicity and Order, I
Room 124, Hasbrouck Laboratory

8:30 a.m.
A spectral dictionary.
Marjorie Senechal*, Smith College
(8604232)

9:00 a.m.
On certain properties of deterministic disorder generated by substitutions of finite automata.
Fran\c coise Axel*, Solid State Physics Laboratory, France
(86082137)

9:30 a.m.
Faulttolerant and selforganizing cellular automata.
Peter G\'acs*, Boston University
(8606834)

Saturday October 20, 1990, 10:00 a.m.11:00 a.m.
Invited Address

Saturday October 20, 1990, 12:30 p.m.1:30 p.m.
Invited Address
Global dynamics of delay differential equations.
Room 131, Marcus Hall
John J. MalletParet*, Brown University
(8603973)

Saturday October 20, 1990, 1:45 p.m.4:05 p.m.
Special Session on Hyperbolic Manifolds, II
Room 20, Goessmann Laboratory

1:45 p.m.
The geometry of hyperbolic manifolds.
John G. Ratcliffe*, Vanderbilt University
(86022114)

2:15 p.m.
Totally geodesic surfaces in hyperbolic 3manifolds.
William Menasco, State University of New York, College at Buffalo
Alan W. Reid*, Ohio State University, Columbus and University of Aberdeen, Scotland
(8605752)

2:45 p.m.
Configurations of curves on surfaces.
Joel Hass, University of California, Davis
Peter Scott*, University of Michigan, Ann Arbor
(8605701)

3:15 p.m.
Geometric triangulations of hyperbolic 3orbifolds.
William D. Dunbar*, Pennsylvania State University, Erie
(8605748)

3:45 p.m.
Dehn surgery and spherical space forms.
Steven A. Bleiler*, Portland State University
Craig Hodgson, Columbia University
(8605751)

Saturday October 20, 1990, 1:45 p.m.4:05 p.m.
Special Session on Lattices, Geometry, and Combinatorics, II
Room 103, Lederle Graduate Research Center

1:45 p.m.
Lattices of quasivarieties of 3element algebras.
M. E. Adams*, State University of New York, College at New Paltz
W. Dziobiak, N. Copernicus University, Poland
(8600656)

2:15 p.m.
Equational theory of ifthenelse.
Ernest G. Manes*, University of Massachusetts, Amherst
(8600653)

2:45 p.m.
Halting sets of programs over universal algebras.
H. Peter Gumm*, State University of New York, College at New Paltz
(86068103)

3:15 p.m.
Varieties of demipseudocomplemented lattices.
Hanamantagouda P. Sankappanavar*, State University of New York, College at New Paltz
(86006132)

3:45 p.m.
A characterization of finite subdirectly irreducible lattices.
J. B. Nation*, University of Hawaii, Honolulu
(8600654)

Saturday October 20, 1990, 1:45 p.m.4:05 p.m.
Special Session on Nonlinear Dynamics in Mathematics and Science, II
Room 126, Hasbrouck Laboratory

1:45 p.m.
Chaotic spikes arising from a model of bursting in excitable membranes.
David Terman*, Ohio State University, Columbus
(86092116)

2:15 p.m.
Existence and stability of travelling wave solutions.
Roger Lui*, Worcester Polytechnic Institute
(8603570)

2:45 p.m.
Nonlinear development of detonation instabilities.
Victor Roytburd*, Rensselaer Polytechnic Institute
(86076106)

3:15 p.m.
Weak shocks for a lambdaomega system are stable.
Todd Kapitula*, Brown University
(8603578)

3:45 p.m.
Nonphysical limits of solutions of the NavierStokes equations for compressible flow.
David Hoff*, Indiana University, Bloomington
Denis Serre, Ecole Normale Superieure de Lyon, France
(8603536)

Saturday October 20, 1990, 1:45 p.m.4:05 p.m.
Special Session on Semigroups, II
Room 111, Lederle Graduate Research Center

1:45 p.m.
The structure sheaf of a Baersemigroup.
Gary D. Crown*, Wichita State University
Melvin F. Janowitz, University of Massachusetts, Amherst
(8600663)

2:15 p.m.
Embeddability of functions in oneway flows.
Abe Sklar*, Illinois Institute of Technology
(8603961)

2:45 p.m.
Semigroups, ruled continua, and fixed points.
Louis F. McAuley*, State University of New York, Binghamton
(8605764)

3:15 p.m.
Discussion

Saturday October 20, 1990, 1:45 p.m.4:35 p.m.
Special Session on Discrete Groups and Geometric Structures in 2, 3 and 4 Dimensions, IIA
Room 64, Goessmann Laboratory

1:45 p.m.
Parabolic elements and Margulis spacetimes.
Todd A. Drumm*, University of Maryland, College Park
(8605323)

2:15 p.m.
A Seifert geometry for SO(p,q+1).
Kyung Bai Lee, University of Oklahoma
Frank Raymond*, University of Michigan, Ann Arbor
(86057146)

2:45 p.m.
The biholomorphic automorphisms of Schottky space.
Clifford J. Earle*, Cornell University
(8603022)

3:15 p.m.
Projective structures with Schottky holonomy.
Daniel Gallo*, Saint John's University
(8603077)

3:45 p.m.
Twogenerator discrete subgroups of PSL(2,R): The geometry of intersecting axes.
Jane Gilman*, Rutgers University, Newark
(8603083)

4:15 p.m.
Upper bounds for the Hausdorff dimension of nonergodic sets of measured foliations.
Howard Masur*, University of Illinois, Chicago
(8603284)

Saturday October 20, 1990, 1:45 p.m.4:35 p.m.
Special Session on Discrete Groups and Geometric Structures in 2, 3 and 4 Dimensions, IIB
Room 51, Goessmann Laboratory

1:45 p.m.
Kahler manifolds and 1/4pinching.
Luis Hern\'andez*, University of Chicago
(86053108)

2:15 p.m.
Schottky groups with automorphisms.
Ruben A. Hidalgo*, State University of New York, Stony Brook
(86099149)

2:45 p.m.
On geometrically finite Kleinian groups.
Irwin Kra*, State University of New York, Stony Brook
(86030105)

3:15 p.m.
On holomorphic motions.
Zbigniew Slodkowski*, University of Illinois at Chicago
(86032134)

3:45 p.m.
The hyperbolic characteristic submanifold theorem.
Bernard Maskit*, State University of New York, Stony Brook
(8603087)

4:15 p.m.
Pellian reflections and continued fractions on the radical p surface.
Mark Sheingorn*, Bernard M. Baruch College, City University of New York
(8601102)

Saturday October 20, 1990, 1:45 p.m.4:05 p.m.
Special Session on Lie Groups and Algebraic Groups, II
Room 201, Lederle Graduate Research Center

1:45 p.m.
Infinitesimal structure of representations: Some examples.
Roger E. Howe*, Yale University
(8602214)

2:15 p.m.
Invariant theory and symplectic structure of nilpotent orbits.
R. K. Brylinski*, Pennsylvania State University, University Park
B. Kostant, Massachusetts Institute of Technology
(86022120)

2:45 p.m.
Prolongation of gmodules.
Gregg J. Zuckerman*, Yale University
(8601715)

3:15 p.m.
Lagrangian construction of the enveloping algebra of sl_n.
Victor Ginsburg*, Moscow State University, USSR
(8601718)

3:45 p.m.
Irreducible representations of Lie superalgebras.
Vera Serganova*, Yale University
(86017147)

Saturday October 20, 1990, 1:45 p.m.3:35 p.m.
Special Session on Algebraic Graph Theory, II
Room 101, Lederle Graduate Research Center

1:45 p.m.
Enumeration of highly irregular trees by automorphism group order.
Kathleen A. McKeon*, Connecticut College
(86005101)

2:15 p.m.
On selfcomplementary graphs.
M. S. Krishnamoorthy*, Rensselaer Polytechnic Institute
M. McMenamin, Rensselaer Polytechnic Institute
(8600585)

2:45 p.m.
Stable sets, maxcuts and quadratic 01 optimization.
JeanMarie Bourjolly*, Concordia University
(86049118)

Saturday October 20, 1990, 1:45 p.m.4:05 p.m.
Special Session on Ergodic Theory, II
Room 203, Lederle Graduate Research Center

1:45 p.m.
An ergodic transformation with no nontrivial selfeven equivalences.
Adam Fieldsteel*, Wesleyan University
Daniel J. Rudolph, University of Maryland, College Park
(8602843)

2:15 p.m.
KroneckerGaussian processes and some counterexamples.
Andr\'es del Junco*, University of Toronto
(8602845)

2:45 p.m.
Uniformly sweeping out does not imply mixing.
T. M. Adams, State University of New York, Albany
N. A. Friedman*, State University of New York, Albany
(8602838)

3:15 p.m.
A classification of the isometric extensions of a multidimensional Bernoulli shift.
Janet Whalen Kammeyer*, United States Naval Academy
(8602842)

3:45 p.m.
On the classification of Z^dactions up to Kakutani equivalence.
J. Roberto Hasfura*, Trinity University
(86028131)

Saturday October 20, 1990, 1:45 p.m.4:05 p.m.
Special Session on Aperiodicity and Order, II
Room 124, Hasbrouck Laboratory

1:45 p.m.
Long range order from local rules.
Charles Radin*, University of Texas, Austin
(8606031)

2:15 p.m.
Icosahedral solids: Perfect quasicrystals or random tilings?
David P. Divincenzo*, IBM T. J. Watson Research Center, Yorktown Heights, New York
(8608233)

2:45 p.m.
High order mixing.
Shahar Mozes*, Hebrew University, Israel
(8602812)

3:15 p.m.
On the work of Godreche and Luck.
Jean E. Taylor*, Rutgers University, New Brunswick
(8608207)

3:45 p.m.
Why do real atoms form quasicrystals?
Veit Elser*, LASSP, Cornell University
(86082141)
Inquiries: meet@ams.org