AMS Sectional Meeting Full Program
Current as of Tuesday, April 12, 2005 15:09:04
Eastern 1993 Spring Sectional Meeting
Washington, DC, April 1718, 1993
Meeting #881
Associate secretaries: Lesley M Sibner, AMS lsibner@duke.poly.edu
Saturday April 17, 1993

Saturday April 17, 1993, 8:00 a.m.10:50 a.m.
Special Session on Wavelets in Sampling Theory and Signal Processing, I
Room 1002, Downing Hall

8:00 a.m.
A class of band limited cardinal wavelets.
G. G. Walter*, University of Wisconsin, Milwaukee
Y. M. Liu, University of Wisconsin, Milwaukee
(8814124) 
8:30 a.m.
Adaptive decompositions with timefrequency atoms.
Stephane Mallat, Courant Institute of Mathematical Sciences, New York University
Zhifeng Zhang*, Courant Institute of Mathematical Sciences, New York University
(8819415) 
9:00 a.m.
Acceleration of the frame algorithm.
Karlheinz Gr\"ochenig*, University of Connecticut, Storrs
(8814216) 
9:30 a.m.
Irregular sampling and a wavelet auditory model.
John J. Benedetto*, University of Maryland, College Park
(8814261) 
10:00 a.m.
On the extension of the Zak transform.
Ahmed I. Zayed*, University of Central Florida
Piotr Mikusinski, University of Central Florida
(88142188) 
10:30 a.m.
Some remarks on wavelet transforms and sampling.
E. Bing Lin*, University of Illinois, Chicago
Tomasz Bielecki, University of Illinois, Chicago
Jie Chen, University of Illinois, Chicago
Stephen S.T. Yau, University of Illinois, Chicago
(8814254)

8:00 a.m.

Saturday April 17, 1993, 8:00 a.m.10:50 a.m.
Special Session on Undergraduate Research in Applied Mathematics, I
Room 202, Locke Hall

8:00 a.m.
Orientation 
8:30 a.m.
Discussion

8:00 a.m.

Saturday April 17, 1993, 8:00 a.m.10:50 a.m.
Special Session on Undergraduate Research in Pure Mathematics, I
Room 200, Locke Hall

8:00 a.m.
Orientation 
9:00 a.m.
On the shellability of the poset of psubgroups of a finite group.
Samuel Kutin*, Old Westbury, New York
Murad \"Ozayd\i n, University of Oklahoma
(88120109) 
9:30 a.m.
Counting nilpotent pairs.
Jeffrey Vanderkam*, Durham, North Carolina
Jason Fulman, Harvard University
Mike Galloy, RoseHulman Institute of Technology
(8812093) 
10:00 a.m.
A formula for the distribution character of representations of SL(2,R), using the Cayley transform.
Sally Picciotto*, Yale University
(88122108) 
10:30 a.m.
Asymptotic cones of elliptic orbits in sp_4(R).
Linie Chang, Duke University
Michael Kleber, Harvard University
Edward Mosteig*, University of Michigan, Ann Arbor
(88122112)

8:00 a.m.

Saturday April 17, 1993, 8:20 a.m.10:50 a.m.
Special Session on Nonlinear Elliptic Problems in Geometry and Physics, I
Room 320, Just Hall

8:20 a.m.
The level set method for nonlinear PDE.
Lawrence C. Evans*, University of California, Berkeley
(88135119) 
9:00 a.m.
Evolving plane curves by curvature in relative geometries II.
Michael E. Gage*, University of Rochester
Yi Li, University of Rochester
(8815377) 
9:40 a.m.
Flat flow is motion by crystalline curvature for curves with crystalline energies.
Fred Almgren, Princeton University
Jean E. Taylor*, Rutgers University, New Brunswick
(8813578) 
10:20 a.m.
Flat curvature flow and crystal growth.
Jean E. Taylor, Rutgers University, New Brunswick
Frederick Almgren*, Princeton University
Lihe Wang, Princeton University
(88135115)

8:20 a.m.

Saturday April 17, 1993, 8:30 a.m.10:50 a.m.
Special Session on Dilation and Interpolation: Operator Theoretic Methods, I
Room 224, Just Hall

8:30 a.m.
Prediction and the Nehari problem.
I. Gohberg, Tel Aviv University, Israel
H. J. Landau*, AT&T Bell Laboratories, Murray Hill, New Jersey
(88147201) 
9:00 a.m.
Positive extensions of almost periodic functions.
Ilya M. Spitkovsky*, College of William & Mary
Hugo J. Woerdeman, College of William & Mary
(8813070) 
9:30 a.m.
A Nehari theorem in the bidisk.
Mischa Cotlar, Universidad Central de Venezuela, Venezuela
Cora Sadosky*, Howard University
(88132200) 
10:00 a.m.
Linearly constrained interpolation in nest algebras.
Mih\'aly Bakonyi, Georgia State University
Hugo J. Woerdeman*, College of William & Mary
(8814705) 
10:30 a.m.
Extensions with positive real part. A new version of the abstract band method.
Robert L. Ellis*, University of Maryland, College Park
(88147145)

8:30 a.m.

Saturday April 17, 1993, 8:30 a.m.10:50 a.m.
Special Session on Graph Theory, I
Room 2006, Downing Hall

8:30 a.m.
On a problem of Posa and Seymour.
Ralph Faudree, Memphis State University
Ronald Gould, Emory University
Michael S. Jacobson*, University of Louisville
(8810585) 
9:00 a.m.
Toughness and trianglefree graphs.
D. Bauer*, Stevens Institute of Technology
J. van den Heuvel, University of Twente, Netherlands
E. Schmeichel, San Jose State University
(88105156) 
9:30 a.m.
Degree conditions and cycle extendability.
R. J. Faudree, Memphis State University
R. J. Gould, Emory University
M. S. Jacobson, University of Louisville
L. M. Lesniak*, Drew University
(88105137) 
10:00 a.m.
Monochromatic spanning trees in 2colored graphs.
R. J. Faudree*, Memphis State University
R. J. Gould, Emory University
M. S. Jacobson, University of Louisville
L. M. Lesniak, Drew University
(88105207) 
10:30 a.m.
Mixed Ramsey numbers: Total chromatic number and stars.
Guantao Chen*, North Dakota State University, Fargo
(88105158)

8:30 a.m.

Saturday April 17, 1993, 8:30 a.m.10:50 a.m.
Special Session on Pure and Applied Recursion Theory, I
Room 2104, Downing Hall

8:30 a.m.
Cantor singleton.
Georgia Martin, University of Maryland, College Park
James Owings*, University of Maryland, College Park
(8810337) 
9:00 a.m.
On the CantorBendixon rank of recursively enumerable sets.
Peter Cholak*, University of Michigan, Ann Arbor
Rod Downey, Victoria University of Wellington, New Zealand
(8810310) 
9:30 a.m.
Iterated relative recursive enumerability.
Peter A. Cholak, University of Michigan, Ann Arbor
Peter G. Hinman*, University of Michigan, Ann Arbor
(8810359) 
10:00 a.m.
Nondeterministic recursion.
Yiannis N. Moschovakis*, University of California, Los Angeles
(88103216) 
10:30 a.m.
Logic on an Eclosed set.
Gerald E. Sacks*, Harvard University and Massachusetts Institute of Technology
(8810317)

8:30 a.m.

Saturday April 17, 1993, 8:30 a.m.10:50 a.m.
Special Session on Geometric Methods in Combinatorics, I
Room 2002, Downing Hall

8:30 a.m.
On signrepresentable matroids.
James Oxley*, Louisiana State University, Baton Rouge
Geoff Whittle, Victoria University of Wellington, New Zealand
(88105204) 
9:00 a.m.
Random packing of matroid bases.
Safwan Akkari*, Indiana UniversityPurdue University, Ft.\ Wayne
(88105127) 
9:30 a.m.
Quaternary paving matroids.
Sanjay Rajpal*, Dartmouth College
(88105198) 
10:00 a.m.
Recent progress on matroid reconstruction.
William P. Miller*, George Washington University
(88105144) 
10:30 a.m.
Rigidity matroids.
Brigitte Servatius*, Worcester Polytechnic Institute
(88105187)

8:30 a.m.

Saturday April 17, 1993, 8:30 a.m.10:40 a.m.
Session on Contributed Papers, I
Room 236, Locke Hall

8:30 a.m.
On ethnomathematics: An enquiry on comparative truth.
Danielle Mihram, University of California, Los Angeles
G. Arthur Mihram*, Princeton, New Jersey
(88103203) 
8:45 a.m.
Infinite covering systems of congruences which don't exist.
Ethan Lewis*, University of Pennsylvania
(8811113) 
9:00 a.m.
Resolving false computations in multiple item residue number systems.
John Sadowsky*, Johns Hopkins University
(8811174) 
9:15 a.m.
Product formula for minimal polynomials.
JieTai Yu*, Cornell University
(8811206) 
9:30 a.m.
The relationship of generalized subWronskians of phi:E^m right arrow E^n to linear dependence and curvature.
Kenneth Wolsson*, Fairleigh Dickinson University, Teaneck
(88115139) 
9:45 a.m.
Simple noncommutative Jordan algebras satisfying ([x,y],y,y)=0.
R. D. Schafer*, Massachusetts Institute of Technology
(88117131) 
10:00 a.m.
padic spherical distributions.
Jeffrey Hakim*, American University
(88122214) 
10:15 a.m.
A nonmonotone coupling and a Poisson approximation.
Patrick D. Burghardt, University of Wisconsin, Madison
Anant P. Godbole*, Michigan Technological University
Amy B. Prengaman, Health Care Investment Analysts, Maryland
(8816080) 
10:30 a.m.
Automata and response pattern of individuals.
Ponnammal Natarajan*, Anna University, India
(8819230)

8:30 a.m.

Saturday April 17, 1993, 9:00 a.m.10:50 a.m.
Special Session on Ergodic Theory, Dynamical Systems and Applications, I
Room 3022, Downing Hall

9:00 a.m.
Restricted orbit equivalence for ergodic Z^dactions.
Janet Whalen Kammeyer*, United States Naval Academy
Daniel J. Rudolph, University of Maryland, College Park
(8812841) 
9:30 a.m.
Rotation intervals for diffeomorphisms of the plane.
Kathleen Alligood*, George Mason University
(8815842) 
10:00 a.m.
Quasiconformal extensions, Zygmund conformal structures and wandering domains.
Alec Norton*, University of Texas, Austin
Dennis Sullivan, Graduate School and University Center, City University of New York
(8815844) 
10:30 a.m.
Aperiodic tiling and substitution dynamics.
Charles Radin*, University of Texas, Austin
(8815203)

9:00 a.m.

Saturday April 17, 1993, 9:00 a.m.10:50 a.m.
Special Session on Low Dimensional Topology, I
Room 2114, Downing Hall

9:00 a.m.
Entropy invariants for knots.
Daniel S. Silver*, University of South Alabama
(8815766) 
9:30 a.m.
Connected sums, Floer homology and spectral sequence.
Weiping Li*, Yale University
(8815714) 
10:00 a.m.
Mapping class groups, quantum invariants and quadratic forms.
Gretchen Wright*, Columbia University
(8815767) 
10:30 a.m.
Some mod 3 relations between Donaldson polynomial invariants.
Selman Akbulut*, Michigan State University
(88157208)

9:00 a.m.

Saturday April 17, 1993, 9:30 a.m.10:50 a.m.
Special Session on History of Mathematics, I
Room 3116, Downing Hall

9:30 a.m.
Eighty years of Sommerfeld's radiation condition.
Steven H. Schot*, American University
(8810107) 
10:00 a.m.
Euclid and his Victorian defender.
Thomas Drucker*, Modern Logic, Pennsylvania
(88101163) 
10:30 a.m.
Root extraction in the American curriculum.
David L. Roberts*, Johns Hopkins University, Baltimore
(8810123)

9:30 a.m.

Saturday April 17, 1993, 9:40 a.m.10:50 a.m.
Special Session on Mathematics of Twodimensional Quantum Field Theory, I
Room 316, Just Hall

9:40 a.m.
Fermionic sum representations for branching functions of affine Lie algebras.
Timothy R. Klassen, Rutgers University, Piscataway
Rinat Kedem, State University of New York, Stony Brook
Barry M. McCoy*, State University of New York, Stony Brook
Ezer Melzer, State University of New York, Stony Brook
(88181182) 
10:20 a.m.
Characters, dilogarithm and TBA: The case of parafermion CFT.
Tomoki Nakanishi*, Harvard University
(88181180)

9:40 a.m.

Saturday April 17, 1993, 11:00 a.m.11:50 a.m.
Invited Address
Graphs in representation theory.
Biology Greenhouse Auditorium, Just Hall
Fan R. K. Chung*, Bellcore, New Jersey
(88105155) 
Saturday April 17, 1993, 1:30 p.m.2:20 p.m.
Invited Address 
Saturday April 17, 1993, 2:40 p.m.4:00 p.m.
Special Session on Dilation and Interpolation: Operator Theoretic Methods, II
Room 224, Just Hall

2:40 p.m.
Interpolation of real rational matrix functions.
J. A. Ball, Virginia Polytechnic Institute and State University
I. Gohberg, Tel Aviv University, Israel
L. Rodman*, College of William and Mary
(88115140) 
3:10 p.m.
Zeropole interpolation for matrix meromorphic functions on an algbraic curve with determinantal representation.
Joseph A. Ball*, Virginia Polytechnic Institute and State University
(88147159) 
3:40 p.m.
Zeropole subspace interpolation and complex vector bundles.
Kevin Clancey*, University of Georgia
(88130128)

2:40 p.m.

Saturday April 17, 1993, 2:40 p.m.5:30 p.m.
Special Session on Wavelets in Sampling Theory and Signal Processing, II
Room 1002, Downing Hall

2:40 p.m.
Waveletframes and nonparametric statistical estimation: Irregular samples and noises.
Christian Houdre*, Stanford University
(88162194) 
3:10 p.m.
Timevarying orthogonal best bases.
Martin Vetterli*, Columbia University
Cormac Herley, Columbia University
Kannan Ramchandran, Columbia University
(88142213) 
3:40 p.m.
Discrete spline filters for multiresolutions and wavelets of l_2.
Akram Aldroubi*, National Institute of Health, Maryland
Murray Eden, National Institute of Health, Maryland
Michael Unser, National Institute of Health, Maryland
(88142149) 
4:10 p.m.
Reproducing kernal Hilbert spaces from sampling theorems.
M. Zuhair Nashed*, University of Delaware
Gilbert G. Walter, University of Wisconsin, Milwaukee
(88142189) 
4:40 p.m.
Continuity of the joint spectral radius: Application to wavelets.
Christopher Heil*, Massachusetts Institute of Technology
(8813981) 
5:10 p.m.
Wavelet transforms and spectral estimations.
Lonnie H. Hudgins*, Northrop Electronics Systems Division, California
(8819432)

2:40 p.m.

Saturday April 17, 1993, 2:40 p.m.4:30 p.m.
Special Session on Graph Theory, II
Room 2006, Downing Hall

2:40 p.m.
How the rank of a graph is effected by vertex/edge addition or deletion.
Jean Bevis, Georgia State University
Kevin Blount, Georgia State University
George Davis, Georgia State University
Gayla Domke*, Georgia State University
Valeria Miller, Georgia State University
(88105171) 
3:10 p.m.
The latest on sphereofinfluence graphs.
Marc J. Lipman*, Office of Naval Research, Virginia
(88105205) 
3:40 p.m.
On Rado numbers.
Stefan A. Burr, City College, City University of New York
S. P. Loo*, West Virginia University
(88105132) 
4:10 p.m.
Either a graph or its complement contains a spanning broom.
Stefan A. Burr*, City College, City University of New York
(88105218)

2:40 p.m.

Saturday April 17, 1993, 2:40 p.m.4:00 p.m.
Special Session on Undergraduate Research in Applied Mathematics, II
Room 202, Locke Hall

2:40 p.m.
The inverse problem for arbitrary networks.
Kevin Rosema*, University of Washington
(8819486) 
3:10 p.m.
Flow dependent networks.
Christopher L. Cox*, Northwestern University
(88194110) 
3:40 p.m.
Computing Grobner bases on the MasPar MP1.
Thomas Vincent Berry*, WinstonSalem, North Carolina
(88168102)

2:40 p.m.

Saturday April 17, 1993, 2:40 p.m.4:30 p.m.
Special Session on Undergraduate Research in Pure Mathematics, II
Room 200, Locke Hall

2:40 p.m.
Algebraic and topologic structure results for the space of infinite matrices.
Mitch Anderson, University of Hawaii, Hilo
Alistair K. Bostrom*, University of Hawaii, Hilo
(8811548) 
3:10 p.m.
Permutation invariant norms on R^n.
Paras P. Mehta*, Harvard University
(8811592) 
3:40 p.m.
Poisson approximation and the area of a random polygon.
Kevin Wald*, New York, New York
(88160106) 
4:10 p.m.
A counterexample to the conjecture on the coefficients of normalized univalent functions which map the unit disk into itself.
Daniel Lewis Dreibelbis*, University of Virginia
(88130107)

2:40 p.m.

Saturday April 17, 1993, 2:40 p.m.5:00 p.m.
Special Session on Ergodic Theory, Dynamical Systems and Applications, II
Room 3022, Downing Hall

2:40 p.m.
Hidden linearity in relaxation oscillations.
Mark Levi*, Rensselaer Polytechnic Institute
(88158122) 
3:10 p.m.
Natural factors of measurepreserving maps.
Andres del Junco*, University of Toronto
Mariusz Lemanczyk, Nicholas Copernicus University, Poland
Mieczyslaw Mentzen, Nicholas Copernicus University, Poland
(88128153) 
3:40 p.m.
Approximating the invariant measures of finite dimensional maps.
Fern Hunt*, National Institute of Standards & Technology, Maryland
(8815808) 
4:10 p.m.
Wavelet projections of an evolution equation.
Juan Elezgaray, CNRS, France
Gal Berkooz, Cornell University
Philip Holmes*, Cornell University
(8815836) 
4:40 p.m.
IP cluster points and recurrent sequences.
Kamel N. Haddad*, California State University, Bakersfield
Aimee Johnson, Tufts University
(88154114)

2:40 p.m.

Saturday April 17, 1993, 2:40 p.m.5:10 p.m.
Special Session on Nonlinear Elliptic Problems in Geometry and Physics, II
Room 320, Just Hall

2:40 p.m.
The selfdual cosmological equations.
Yisong Yang*, Carnegie Mellon University
(8813525) 
3:20 p.m.
Statistical equilibrium solutions for the Euler equations.
Nathaniel Whitaker*, University of Massachusetts, Amherst
Bruce Turkington, University of Massachusetts, Amherst
(88135116) 
4:00 p.m.
On the positive solutions of Matukuma equation.
Yi Li*, University of Rochester
(8813452) 
4:40 p.m.
Local behavior and classification of positive solutions of semilinear elliptic equations with supercritical Sobolev growth.
Henghui Zou*, Northwestern University
(8813576)

2:40 p.m.

Saturday April 17, 1993, 2:40 p.m.5:00 p.m.
Special Session on Geometric Methods in Combinatorics, II
Room 2002, Downing Hall

2:40 p.m.
Connnecting characteristic and chromatic polynomials.
Andreas Blass, University of Michigan, Ann Arbor
Bruce E. Sagan*, Michigan State University
(88152136) 
3:10 p.m.
Signcoherent identities for characteristic polynomials of matroids.
Joseph P. S. Kung*, University of North Texas
(8810549) 
3:40 p.m.
Greedoids and the Tutte polynomial.
Gary Gordon*, Lafayette College
(88105147) 
4:10 p.m.
An algorithmic view of Crapo's BETAinvariant.
Lorenzo Traldi*, Lafayette College
(88105126) 
4:40 p.m.
Ramsey numbers for matroids.
Talmage Reid*, University of Mississippi
(8810501)

2:40 p.m.

Saturday April 17, 1993, 2:40 p.m.5:00 p.m.
Special Session on Low Dimensional Topology, II
Room 2114, Downing Hall

2:40 p.m.
Infinite framed link diagrams of open 3manifolds.
Jim Hoste*, Pitzer College
(88157195) 
3:10 p.m.
Dehn surgery on knots in the 3sphere.
Cameron Gordon*, University of Texas, Austin
John Luecke, University of Texas, Austin
(88157210) 
3:40 p.m.
Tangle sums producing simple tangles.
YingQing Wu*, University of Texas, Austin
(8815755) 
4:10 p.m.
Spectral flow and analyticity for operators on manifolds with boundary.
Eric P. Klassen*, Florida State University
Paul A. Kirk, Indiana University, Bloomington
(88157217) 
4:40 p.m.
Casson's invariant for closed 3manifolds with even first Betti number.
Cynthia L. Curtis*, Princeton University
(88157196)

2:40 p.m.

Saturday April 17, 1993, 2:45 p.m.5:35 p.m.
Special Session on Mathematics of Twodimensional Quantum Field Theory, II
Room 316, Just Hall

2:45 p.m.
On the BRSTalgebraic structure in string theory.
Bong Lian*, University of Toronto
Gregg Zuckerman, Yale University
(88117177) 
3:25 p.m.
BatalinVilkovisky algebras in quantum field theory.
Albert S. Schwarz*, University of California, Davis
(88181183) 
4:25 p.m.
BatalinVilkovisky algebras and twodimensional topological field theory.
Ezra Getzler*, Massachusetts Institute of Technology
(88155174) 
5:05 p.m.
The Macdonald constant term conjecture.
Ivan Cherednik*, University of North Carolina, Chapel Hill
(88117173)

2:45 p.m.

Saturday April 17, 1993, 2:45 p.m.4:55 p.m.
Special Session on History of Mathematics, II
Room 3116, Downing Hall

2:45 p.m.
The volume of a sphere in ancient China.
Frank Swetz*, Pennsylvania State University
(88101118) 
3:25 p.m.
The algebra of logic: What Boole really started.
Judy Green*, Marymount University
(88101157) 
4:05 p.m.
Leonhard Euler: The Berlin yearsA preliminary study.
Ronald Calinger*, Catholic University of America
(88101143) 
4:35 p.m.
The American Mathematical Endeavor: 17761876.
Karen V. H. Parshall*, University of Virginia
(88101125)

2:45 p.m.

Saturday April 17, 1993, 2:45 p.m.5:10 p.m.
Session on Contributed Papers, II
Room 236, Locke Hall

2:45 p.m.
Inequalities concerning the L^p norm of a polynomial and its derivative.
Robert B. Gardner, Louisiana State University, Shreveport
Narendra K. Govil*, Auburn University, Auburn
(88130150) 
3:00 p.m.
Sampling vs. interpolation for entire functions.
Carl Prather*, Virginia Polytechnic Institute and State University
(88130170) 
3:15 p.m.
Factorization of A(z) + B(w) under composition.
Lee A. Rubel, University of Illinois, UrbanaChampaign
ChungChun Yang*, Hong Kong University of Science & Technology, Hong Kong
(8813204) 
3:30 p.m.
Metrics for singular analytic spaces.
C. G. Grant*, United States Naval Academy
P. Milman, University of Toronto
(88132151) 
3:45 p.m.
Precauchy spaces.
D. C. Kent*, Washington State University
Nandita Rath, Washington State University
(88154123) 
4:00 p.m.
Metrizability in isocompact wM spaces.
G. R. Hiremath*, Talladega College
(88154202) 
4:15 p.m.
The topology of quasibundles.
H. MovahediLankarani*, Pennsylvania State University, Altoona
R. Wells, Pennsylvania State University, University Park
(88155130) 
4:30 p.m.
Flat 3manifolds appear as cusps of hyperbolic 4manifolds.
Barbara E. Nimershiem*, Franklin & Marshall College
(8815775) 
4:45 p.m.
The Ore condition for polynomial rings.
Ferrran Ced\'o, University Autonoma de Barcelona, Spain
Delors Herbera*, Rutgers University, New Brunswick
(88116221) 
5:00 p.m.
Maximal module theorems.
Carl Faith*, Rutgers University, New Brunswick
(88116222)

2:45 p.m.

Saturday April 17, 1993, 3:00 p.m.5:20 p.m.
Special Session on Pure and Applied Recursion Theory, II
Room 2104, Downing Hall

3:00 p.m.
Game extraction of programs from specifications.
Anil Nerode*, Cornell University
Jeffrey B. Remmel, Cornell University
Alex Yakhnis, Cornell University
(8810373) 
3:30 p.m.
Mixed systems.
C. J. Ash, Monash University, Australia
J. F. Knight*, University of Notre Dame
(8810319) 
4:00 p.m.
The structural approach to the P vs. NP problem.
Stuart A. Kurtz*, University of Chicago
(8810372) 
4:30 p.m.
Priority arguments using iterated trees of strategies, II.
Steffen Lempp, University of Wisconsin, Madison
Manuel Lerman*, University of Connecticut, Storrs
(8810340) 
5:00 p.m.
Priority arguments using iterated trees of strategies.
Steffen Lempp*, University of Wisconsin, Madison
Manuel Lerman, University of Connecticut, Storrs
(8810339)

3:00 p.m.
Sunday April 18, 1993

Sunday April 18, 1993, 8:20 a.m.10:50 a.m.
Special Session on Nonlinear Elliptic Problems in Geometry and Physics, III
Room 138, Douglass Hall

8:20 a.m.
The Dirichlet problem for a class of fully nonlinear elliptic equations.
Bo Guan*, Indiana University, Bloomington
(88135117) 
9:00 a.m.
On Weyl problem with nonnegative Gauss curvature.
Pengfei Guan*, McMaster University,
Yanyan Li, Rutgers University, New Brunswick
(8815828) 
9:40 a.m.
Numerical solutions of boundary value problems for Ksurfaces.
Frank Baginski*, George Washington University
Nate Whitaker, University of Massachusetts, Amherst
(8813579) 
10:20 a.m.
A nonminimal solution of the YangMillsHiggs equation with positive coupling constant.
Janet Talvacchia*, Swarthmore College
(88135220)

8:20 a.m.

Sunday April 18, 1993, 8:30 a.m.10:50 a.m.
Special Session on Pure and Applied Recursion Theory, III
Room 238, Douglass Hall

8:30 a.m.
(alpha,Beta)selective sets.
Georgia Martin*, University of Maryland, College Park
(8810312) 
9:00 a.m.
From recursive to online coloring of graphs.
Henry A. Kierstead*, Arizona State University
(8810356) 
9:30 a.m.
Pure and applied PI^0_1 classes.
Douglas Cenzer*, University of Florida
(8810347) 
10:00 a.m.
A cohesive degree which is not high.
Carl Jockusch*, University of Illinois, UrbanaChampaign
Frank Stephan, University of Karlsruhe, Germany
(8810371) 
10:30 a.m.
Jumps of minimal degrees below Q'.
Rod Downey, Victoria University of Wellington, New Zealand
Steffen Lempp, University of Wisconsin, Madison
Richard A. Shore*, Cornell University
(8810309)

8:30 a.m.

Sunday April 18, 1993, 8:30 a.m.10:50 a.m.
Special Session on Ergodic Theory, Dynamical Systems and Applications, III
Room 201, Douglass Hall

8:30 a.m.
Suspensions, inheritance, and flows on homogeneous spaces.
David B. Ellis*, Beloit College
(8815434) 
9:00 a.m.
Central configurations in the 1+n body problem.
Glen Hall*, Boston University
(88170160) 
9:30 a.m.
On the dynamics of some polynomial rootfinding algorithms.
Scott Sutherland*, State University of New York, Stony Brook
(8815835) 
10:00 a.m.
Residual properties of alphaflows.
Andres del Junco, University of Toronto,
Adam Fieldsteel*, Wesleyan University
KyeWon Park, Ajou University,
(88128113) 
10:30 a.m.
Entropy on noncompact spaces.
Bruce Kitchens*, IBM T. J. Watson Research Center, Yorktown Heights, New York
(8812838)

8:30 a.m.

Sunday April 18, 1993, 8:30 a.m.10:50 a.m.
Special Session on Geometric Methods in Combinatorics, III
Room 105, Douglass Hall

8:30 a.m.
A poset of pseudoline arrangements.
Walter D. Morris, Jr.*, George Mason University
(8819022) 
9:00 a.m.
Gram's relation inside out.
Jim Lawrence*, George Mason University
(88152206) 
9:30 a.m.
Lattices and geometry.
M. K. Bennett*, University of Massachusetts, Amherst
(8810618) 
10:00 a.m.
Applications of combinatorial geometries in model theory.
Kitty L. Holland*, Simon Fraser University
(88103197) 
10:30 a.m.
The Borsuk conjecture holds for convex bodies with a belt of regular points.
Boris Dekster*, Mount Allison University
(8815211)

8:30 a.m.

Sunday April 18, 1993, 8:30 a.m.10:50 a.m.
Special Session on Low Dimensional Topology, III
Room 136, Douglass Hall

8:30 a.m.
A diagrammatic theory of knotted surfaces.
J. Scott Carter*, University of South Alabama
Masahico Saito, University of Texas, Austin
(8815760) 
9:00 a.m.
The formal KnizhnikZamolodchikov connection and a universal knot invariant.
XiaoSong Lin*, Columbia University
(8815762) 
9:30 a.m.
A topological quantum theory approach to the AndrewsCurtis conjecture.
Frank Quinn*, Virginia Polytechnic Institute and State University
(8815768) 
10:00 a.m.
Computing spectral flow via cup products.
Paul Kirk*, Florida State University
Eric Klassen, Indiana University, Bloomington
(88157211) 
10:30 a.m.
Infinite generation of PI_1(Diff(M)).
John Kalliongis*, Saint Louis University
Darryl McCullough, University of Oklahoma
(8815753)

8:30 a.m.

Sunday April 18, 1993, 8:30 a.m.10:40 a.m.
Session on Contributed Papers, III
Room 145, Douglass Hall

8:30 a.m.
The tangential structure of fractal measures.
Christoph Bandt*, ErnstMoritzArndt University, Germany
(88128215) 
8:45 a.m.
Discontinuous differential equations.
Abdelkader Boucherif*, Georgia Institute of Technology
Ghouti BoukliHacene, University of Tlemcen, Algeria
(88134166) 
9:00 a.m.
On a degenerate isotropic material.
Ping Wang*, Pennsylvania State University, Schuykill
(88135164) 
9:15 a.m.
The linear shallow water theory: A mathematical justification.
James A. Donaldson, Howard University
Daniel A. Williams*, Howard University
(88135165) 
9:30 a.m.
Solutions of physical problems by decomposition.
George Adomian*, General Analytics Corporation
(88135191) 
9:45 a.m.
Continuity of point derivations in Banach function algebras.
S. I. Ouzomgi*, Pennsylvania State University, University Park
(88146152) 
10:00 a.m.
A new class of Banach spaces.
Tepper L. Gill*, Howard University
W. W. Zachary, Howard University
(88146185) 
10:15 a.m.
An extension of a fixed point theorem.
S. P. Singh*, Memorial University of Newfoundland, Canada
(88147124) 
10:30 a.m.
Torsion relations in the spacetime tangent bundle.
Howard E. Brandt*, Army Research Labaoratory, Maryland
(88153133)

8:30 a.m.

Sunday April 18, 1993, 9:00 a.m.10:50 a.m.
Special Session on Geodesic Flows, Hyperbolic Geometry, and Symbolic Dynamics, I
Room 237, Douglass Hall

9:00 a.m.
Markoff geodesics as matrices.
Harvey Cohn*, City College, City University of New York
(8811102) 
9:30 a.m.
Invariant measures for general Gauss transforms.
Andrew Haas*, University of Connecticut, Storrs
(88111199) 
10:00 a.m.
The continuous diophantine approximation mapping of Szekeres.
Jeffrey C. Lagarias*, AT&T Bell Laboratories, Murray Hill, New Jersey
Andrew D. Pollington, Brigham Young University
(88111142) 
10:30 a.m.
A rigidity theorem for surfaces of variable negative curvature.
Steven P. Lalley*, Purdue University, West Lafayette
(88153186)

9:00 a.m.

Sunday April 18, 1993, 9:00 a.m.10:50 a.m.
Special Session on Wavelets in Sampling Theory and Signal Processing, III
Room 223, Douglass Hall

9:00 a.m.
Sampling and the multisensor deconvolution problem.
David F. Walnut*, George Mason University
(88142120) 
9:30 a.m.
Wavelets on closed sets and applications.
Bj\"orn Jawerth*, University of South Carolina, Columbia
(88142212) 
10:00 a.m.
Scaleangle representation: Application to frequency extraction and sampling.
JP. Antoine, University Catholique de Louvain, Belgium
P. Carrette, University Catholique de Louvain, Belgium
R. Murenzi*, Clark Atlanta University
(88162168) 
10:30 a.m.
An almost orthogonal radial wavelet expansion for radial distributions.
Jay Epperson, University of New Mexico
Michael Frazier*, Michigan State University
(88141146)

9:00 a.m.

Sunday April 18, 1993, 9:00 a.m.10:50 a.m.
Special Session on Graph Theory, III
Room 216, Douglass Hall

9:00 a.m.
Rectilinear crossing number of a complete graph and Sylvester's "Four Point Problem" of geometric probabilty.
Edward R. Scheinerman*, Johns Hopkins University
Herbert S. Wilf, University of Pennsylvania
(8810557) 
9:30 a.m.
The Dinitz problem solved for rectangles.
Jeannette C. M. Janssen*, Lehigh University
(88105148) 
10:00 a.m.
On pintersection representations.
Nancy Eaton, University of Rhode Island
Ronald J. Gould*, Emory University
Vojtech Rodl, Emory University
(88105138) 
10:30 a.m.
Nowherezero 4flows of solvable Cayley graphs.
B. Alspach, Simon Fraser University
YP. Liu, Nanjing Normal, People's Republic of China
CQ Zhang*, West Virginia University
(8810531)

9:00 a.m.

Sunday April 18, 1993, 9:00 a.m.10:50 a.m.
Special Session on Undergraduate Research in Applied Mathematics, III
Room 205, Douglass Hall

9:00 a.m.
Consistency in cooperative game theory.
Roger Lee*, Cambridge, Massachusetts
(88190103) 
9:30 a.m.
Reasonable allocations for PFF and CFF games.
Luz E. Pinzon*, Rutgers University, New Brunswick
(8819094) 
10:00 a.m.
Compound Poisson approximations for word patterns.
Garrick Lee Wallstrom*, Abington, Massachusetts
Allison Michelle Skolnick, East Brunswick, New Jersey
(8816096) 
10:30 a.m.
Statistical tests for Markovdependence.
Sharyn Campbell*, Youngstown, Ohio
(88162111)

9:00 a.m.

Sunday April 18, 1993, 9:00 a.m.10:50 a.m.
Special Session on Undergraduate Research in Pure Mathematics, III
Room 204, Douglass Hall

9:00 a.m.
Some results in Euclidean plane geometry.
Nathan Dunfield*, Corvallis, Oregon
(8815191) 
9:30 a.m.
Factorization in K[x^2,x^3].
Faith Inman*, University of North Carolina, Greensboro
(8811690) 
10:00 a.m.
Unknotting numbers and minimal knot diagrams.
James A. Bernhard*, Princeton University
(88155105) 
10:30 a.m.
Mapping class groups of compact 2manifolds.
Dean Hildebrandt*, Harvard University
(8815589)

9:00 a.m.

Sunday April 18, 1993, 9:00 a.m.10:50 a.m.
Special Session on Mathematics of Twodimensional Quantum Field Theory, III
Room 137, Douglass Hall

9:00 a.m.
Irreducible representations of affine superalgebras and number theory.
Victor Kac*, Massachusetts Institute of Technology
Minoru Wakimoto, Mie University, Japan
(88117175) 
9:40 a.m.
Representations of KacMoody algebras and quantum groups.
David Kazhdan*, Harvard University
George Lusztig, Massachusetts Institute of Technology
(88117178) 
10:20 a.m.
A qdeformation of Wakimoto representation and the quantum KnizhnikZamolodchikov equation.
Atsushi Matsuo*, Nagoya University, Japan
(88181176)

9:00 a.m.

Sunday April 18, 1993, 9:00 a.m.10:50 a.m.
Special Session on History of Mathematics, III
Room 103, Douglass Hall

9:00 a.m.
Calculus after the calculus.
Paul D. Scofield*, Washington & Lee University
(88101167) 
9:40 a.m.
Saint Vincent and the logarithm.
V. Frederick Rickey*, Bowling Green State University
(88101190) 
10:15 a.m.
Pascal's triangle and the solution of polynolmial equations.
Victor J. Katz*, University of the District of Columbia
(88101162)

9:00 a.m.

Sunday April 18, 1993, 9:30 a.m.10:50 a.m.
Special Session on Dilation and Interpolation: Operator Theoretic Methods, III
Room 133, Douglass Hall

9:30 a.m.
A Krein space extension of the CaratheodoryFejer problem.
Gene B. Christner*, University of Virginia
(8814750) 
10:00 a.m.
Julia operators and coefficient problems.
James Rovnyak*, University of Virginia
(8814751) 
10:30 a.m.
Operator theory and the Boselike oscillator.
Marvin Rosenblum*, University of Virginia
(88147161)

9:30 a.m.

Sunday April 18, 1993, 11:00 a.m.11:50 a.m.
Invited Address
On the existence of convex hypersurfaces of constant Gauss curvature in hyperbolic space.
Biology Greenhouse Auditorium, Just Hall
Joel Spruck*, Johns Hopkins University
(88153219) 
Sunday April 18, 1993, 1:30 p.m.2:20 p.m.
Invited Address
Geodesic flows and continued fractions.
Biology Greenhouse Auditorium, Just Hall
Leopold Flatto*, AT&T Bell Laboratories, Murray Hill, New Jersey
(88158129) 
Sunday April 18, 1993, 2:40 p.m.4:30 p.m.
Special Session on Geodesic Flows, Hyperbolic Geometry, and Symbolic Dynamics, II
Room 237, Douglass Hall

2:40 p.m.
Fricke groups and continued fractions.
David Steinbach*, Mathematical Sciences Research Institute, California
(88141192) 
3:10 p.m.
Symbolic dynamics and flow on the Hecke surfaces.
Thomas A. Schmidt*, Widener University
(8815883) 
3:40 p.m.
Intersections of closed geodesics on hyperbolic surfaces.
Thea Pignataro, City College, City University of New York
Hanna Sandler*, American University
(8815169) 
4:10 p.m.
betaTransformations and zeros for a class of power series.
Boris Solomyak*, University of Washington
(8815846)

2:40 p.m.

Sunday April 18, 1993, 2:40 p.m.3:30 p.m.
Special Session on Wavelets in Sampling Theory and Signal Processing, IV
Room 223, Douglass Hall

Sunday April 18, 1993, 2:40 p.m.4:30 p.m.
Special Session on Graph Theory, IV
Room 216, Douglass Hall

2:40 p.m.
Maximal and forbidden unit distance graphs in the plane.
Carolyn R. Mahoney*, California State University, San Marcos
Kiran B. Chilakamarri, Central State University
(88105169) 
3:10 p.m.
Extreme values of the edgeneighborconnectivity.
Margaret B. Cozzens*, National Science Foundation, Washington, DC
ShuShih Yang Wu, Northeastern University
(88105184) 
3:40 p.m.
Sturdy networks.
Barry Piazza, University of Southern Mississippi
Fred Roberts*, Rutgers University, New Brunswick
Sam Stueckle, Northeastern University
(88105135) 
4:10 p.m.
Strongly connected mixed graphs and connected detachments of graphs.
C. St. J. A. NashWilliams*, University of Reading, England
(88105134)

2:40 p.m.

Sunday April 18, 1993, 2:40 p.m.4:30 p.m.
Special Session on Undergraduate Research in Applied Mathematics, IV
Room 205, Douglass Hall

2:40 p.m.
Exotic curves on the Genus2 handlebody.
Michael Bolt*, Grand Rapids, Michigan
(88153100) 
3:10 p.m.
Counting critical points of polynomials.
Ian B. Robertson*, OCMR 1394, Oberlin, Ohio
(8812695) 
3:40 p.m.
An investigation of lifting modulo p as a method for computing Grobner bases.
William L. Cooper*, Philadelphia, Pennsylvania
Janine Ladick, Louisville, Kentucky
(8811287) 
4:10 p.m.
Computational methods for the Igusa local Zeta function.
Frederic Schoenberg*, Brown University
(8811188)

2:40 p.m.

Sunday April 18, 1993, 2:40 p.m.5:00 p.m.
Special Session on Undergraduate Research in Pure Mathematics, IV
Room 204, Douglass Hall

2:40 p.m.
Upper bounds for covering numbers.
Sandra Thompson*, Minneapolis, Minnesota
Eric Vigoda, Rochester, New York
(88105104) 
3:10 p.m.
Randomly C_4decomposable graphs.
Daniel Isaksen*, Berkeley, California
(8810598) 
3:40 p.m.
Which Cayley graphs of prime power order are isomorphic?.
Andrew J. Mauer*, Williams College
(8810599) 
4:10 p.m.
Structural characteristics of V_n(G).
David Weinreich*, Emory University
(8810597) 
4:40 p.m.
Characterization of singular graphs.
Maryanne Brown*, Newton, Massachusetts
(88105101)

2:40 p.m.

Sunday April 18, 1993, 2:40 p.m.4:00 p.m.
Special Session on Ergodic Theory, Dynamical Systems and Applications, IV
Room 201, Douglass Hall

2:40 p.m.
Factors of Cartesian products of nonsingular Chacon maps.
A. del Junco, University of Toronto
Cesar E. Silva*, Williams College
(88128141) 
3:10 p.m.
Remarks on ergodic transformations isomorphic to their inverses.
Geoffrey R. Goodson*, Towson State University
Daniel J. Rudolph, University of Maryland, College Park
(8812833) 
3:40 p.m.
Shadowing and global error of differential equations calculations.
Tim Sauer*, George Mason University
(8815843)

2:40 p.m.

Sunday April 18, 1993, 2:40 p.m.5:10 p.m.
Special Session on Nonlinear Elliptic Problems in Geometry and Physics, IV
Room 138, Douglass Hall

2:40 p.m.
Adding handles to the helicoid.
David Hoffman*, University of Massachusetts, Amherst
Hermann Karcher, University of Bonn, Germany
Fusheng Wei, Texas A\thsp\&\thsp M University, College Station
(8815329) 
3:20 p.m.
The Dirichlet energy of mappings on spheres.
D. Zhang*, Johns Hopkins University
(8815382) 
4:00 p.m.
Regular homotopy classes of minimal surfaces.
Rob Kusner*, Institute for Advanced Study
Nick Schmitt, University of Massachusetts, Amherst
(8815327) 
4:40 p.m.
Nodal sets on Riemannian manifolds.
RuiTao Dong*, Johns Hopkins University
(88153121)

2:40 p.m.

Sunday April 18, 1993, 2:40 p.m.4:00 p.m.
Special Session on Low Dimensional Topology, IV
Room 136, Douglass Hall

2:40 p.m.
A subgroup of the mapping class group compatible with surgery.
Lawrence Smolinsky*, Louisiana State University, Baton Rouge
(8815765) 
3:10 p.m.
A simple proof of the Traczyk Yokota criteria for periodic knots.
J\'ozef H. Przytycki*, Odense University,
(8815745) 
3:40 p.m.
Minimal energy electrostatic knots.
Samuel J. Lomonaco, Jr.*, University of Maryland Baltimore County
(8817821)

2:40 p.m.

Sunday April 18, 1993, 2:45 p.m.4:35 p.m.
Special Session on Mathematics of Twodimensional Quantum Field Theory, IV
Room 137, Douglass Hall

2:45 p.m.
Introduction to Walgebras.
Kareljan Schoutens*, Joseph Henry Laboratories, Princeton University
(88181179) 
3:25 p.m.
Semiinfinite cohomology of Walgebras.
Peter Bouwknegt*, University of Southern California
(88181172) 
4:05 p.m.
Dilogarithm identities, qdifference equations, and the Virasoro algebra.
Edward Frenkel, Harvard University
Andras Szenes*, Massachusetts Institute of Technology
(88117181)

2:45 p.m.

Sunday April 18, 1993, 2:45 p.m.4:20 p.m.
Special Session on History of Mathematics, IV
Room 103, Douglass Hall

2:45 p.m.
Biographical remarks on the life and work of Joaquin Basilio Diaz.
Florence Fasanelli*, Mathematical Association of America
(8810184) 
3:20 p.m.
Calculus for a new century: Granville, Smith and Longley.
George M. Rosenstein*, Franklin & Marshall College
(8810126) 
3:50 p.m.
Thomas Jefferson's contributions to mathematics.
J. J. Tattersall*, Providence College
(8810163)

2:45 p.m.

Sunday April 18, 1993, 3:00 p.m.4:20 p.m.
Special Session on Pure and Applied Recursion Theory, IV
Room 238, Douglass Hall

3:00 p.m.
Using second order logic.
John N. Crossley*, Monash University, Australia
(88103154) 
3:30 p.m.
The two quantifier theory of the recursively enumerable weak truthtable degrees in decidable.
Klaus AmbosSpies, University of Heidelberg, Germany
Peter A. Fejer*, University of Massachusetts, Boston
Steffen Lempp, University of Wisconsin, Madison
Manuel Lerman, University of Connecticut, Storrs
(8810358) 
4:00 p.m.
Recent progress in priority theory.
K. Kontostathis*, Villanova University
(8810364)

3:00 p.m.