AMS Sectional Meeting Full Program
Current as of Tuesday, April 12, 2005 15:08:51
1991 Central Section Meeting
Fargo, ND, October 2526, 1991
Meeting #869
Associate secretaries: Andy R Magid, AMS amagid@ou.edu
Friday October 25, 1991

Friday October 25, 1991, 7:00 a.m.9:50 a.m.
Special Session on Commutative Algebra, I
Century Theater, Memorial Union

7:00 a.m.
Picard groups of curves.
Roger Wiegand*, University of Nebraska, Lincoln
(86913122) 
7:30 a.m.
Examples of reflexive modules.
Frank Demeyer*, Colorado State University
(8691367) 
8:00 a.m.
Maximal ideals in Laurent polynomial rings.
Budh Nashier*, Florida State University
(8691337) 
8:30 a.m.
Modules over Artinian couples.
Christel Rotthaus*, Michigan State University
(8691324) 
9:00 a.m.
Descent properties.
Dana Weston*, University of Missouri, Columbia
(86913151) 
9:30 a.m.
Lengths of factorization of an element into irreducible elements.
D. D. Anderson*, University of Iowa
(8691308)

7:00 a.m.

Friday October 25, 1991, 7:30 a.m.9:50 p.m.
Special Session on Algebraic Geometry, I
Dakota Ballroom, Memorial Union

7:30 a.m.
A determination of the normally generated divisor classes on rational surfaces with integral anticanonical curve.
B. Harbourne*, University of Nebraska, Lincoln
(8691475) 
8:00 a.m.
On terminal singularities with triplepointfree resolutions.
Bruce Crauder*, Oklahoma State University, Stillwater
David Morrison, Duke University
(86914162) 
8:30 a.m.
Curves in P^3 with seminatural cohomology.
Charles Walter*, Rutgers University, New Brunswick
(8691435) 
9:00 a.m.
Equisingularity of quasiordinary singularities.
Chunsheng Ban*, Ohio State University, Mansfield
(8691416) 
9:30 a.m.
Multiplicity of discriminants.
Paolo Aluffi*, Florida State University
Fernando Cukierman, University of Kansas
(8691484)

7:30 a.m.

Friday October 25, 1991, 7:30 a.m.9:50 a.m.
Special Session on Multidimensional Complex Analysis and Operator Theory, I
Prairie Rose Room, Memorial Union

7:30 a.m.
Heat flow and the BerezinToeplitz quantization.
L. A. Coburn*, State University of New York, Buffalo
(86947180) 
8:00 a.m.
Open problems and conjectures in the function theory of Cartan domains.
Adam Koranyi*, Herbert H. Lehman College, City University of New York
(8693246) 
8:30 a.m.
Invariant differential operators and holomorphic function spaces on bounded symmetric domains.
Zhimin Yan*, University of California, Berkeley
(8693288) 
9:00 a.m.
Holomorphic Besov spaces on bounded symmetric domains.
Kehe Zhu*, State University of New York, Albany
(8693206) 
9:30 a.m.
Toeplitz and Hankel operators on the Bergman spaces of the unit ball and the polydisk in C^n.
Karel Stroethoff*, University of Montana
Dechao Zheng, State University of New York, Stony Brook
(8694790)

7:30 a.m.

Friday October 25, 1991, 8:00 a.m.9:50 a.m.
Special Session on The Geometry of Equilibrium Configurations, I
Meadowlark Room, Memorial Union

8:00 a.m.
Boundary value problems for variational integrals involving surface curvatures.
Johannes C.C. Nitsche*, University of Minnesota, Minneapolis
(8694986) 
8:40 a.m.
Evolution of nonparametric surfaces with speed depending on the mean curvature.
Vladimir I. Oliker*, Emory University
Nina N. Uraltseve, Leningrad University, USSR
(86935173) 
9:20 a.m.
The regularity and almost holomorphicity of stable minimal surfaces in arbitrary codimension.
Richard M. Schoen*, Stanford University
(86953175)

8:00 a.m.

Friday October 25, 1991, 8:00 a.m.9:20 a.m.
Special Session on Nonlinear Wave Equations, I
University Chamber, Memorial Union

8:00 a.m.
A steepest descent method for oscillatory RiemannHilbert problems.
Percy Deift*, Courant Institute of Mathematical Sciences, New York University
Xin Zhou, Yale University
(8693523) 
8:45 a.m.
Existence and nonexistence of solitary wave solutions to higher order model evolution equations.
Satyanad Kichenassamy, University of Minnesota, Minneapolis
Peter J. Olver*, University of Minnesota, Minneapolis
(8697622)

8:00 a.m.

Friday October 25, 1991, 8:00 a.m.9:50 a.m.
Special Session on Nonselfadjoint Operator Albebras, I
Peace Garden, Memorial Union

8:00 a.m.
Hypoprojective Hilbert modules over incidence operator algebras.
Paul S. Muhly*, University of Iowa
(8694715) 
8:30 a.m.
Nest embedding limit algebras.
Alan Hopenwasser*, University of Alabama, Tuscaloosa
Justin R. Peters, Iowa State University
(8694734) 
9:00 a.m.
The ideal structure of continuous, semicrossed product algebras.
Michael P. Lamoureux*, University of Ottawa
(86946131) 
9:30 a.m.
Vector states of some non selfadjoint algebras.
SzeKai Tsui*, Oakland University
(8694679)

8:00 a.m.

Friday October 25, 1991, 8:00 a.m.9:50 a.m.
Special Session on Graph Theory, I
Family Life Center, Room 319, Memorial Union

8:00 a.m.
Local indecomposability of certain geometric graphs.
Jonathan I. Hall*, Michigan State University
(8690576) 
8:30 a.m.
Crossings on edges in graph drawings.
Heiko Harborth*, University of Braunschweig, Germany
(8690543) 
9:00 a.m.
Connectivity and strong maps of matroids.
Talmage James Reid*, University of Mississippi
(8690519) 
9:30 a.m.
Some new results on the limit points of eigenvalues of graphs.
Michael Doob*, University of Manitoba
(86905178)

8:00 a.m.

Friday October 25, 1991, 8:00 a.m.9:50 a.m.
Special Session on Lorentz Transformations and Spacetime Geometry, I
Family Life Center, Room 320, Memorial Union

8:00 a.m.
Discrete spacetime and discrete Lorentz subgroup.
A. Das*, Simon Fraser University
(86983179) 
8:30 a.m.
A temporal approach to special relativity.
Robert W. Brehme*, Wake Forest University
(8698313) 
9:00 a.m.
The abstract Lorentz group.
Abraham Ungar*, North Dakota State University
(8698320) 
9:30 a.m.
Equivalence and Cartan forms.
Peter J. Olver*, University of Minnesota, Minneapolis
(8694921)

8:00 a.m.

Friday October 25, 1991, 10:15 a.m.11:05 a.m.
Invited Address
Operator theory and quantization in several complex variables.
Century Theater, Memorial Union
Harald Upmeier*, University of Kansas
(8694754) 
Friday October 25, 1991, 12:30 p.m.1:20 p.m.
Invited Address 
Friday October 25, 1991, 1:40 p.m.4:50 p.m.
Special Session on Nonselfadjoint Operator Albebras, II
Peace Garden, Memorial Union

1:40 p.m.
Absolutely summing maps for operator spaces.
Edward G. Effros, University of California, Los Angeles
ZhongJin Ruan*, University of Illinois, UrbanaChampaign
(8694641) 
2:30 p.m.
Analytic TAF algebras generated by product type cocycles.
Bruce H. Wagner*, Iowa State University
YiuTung Poon, Iowa State University
(8694668) 
3:00 p.m.
Ideals in triangular AF algebras.
Timothy D. Hudson*, Texas A\thsp\&\thsp M University, College Station
(86946169) 
3:30 p.m.
Zanalytic TAF algebras and dynamical systems.
YiuTung Poon*, Iowa State University
Bruce H. Wagner, Iowa State University
(86946149) 
4:00 p.m.
Structure of triangular AF algebras.
Allan P. Donsig*, Texas A\thsp\&\thsp M University, College Station
(86946171) 
4:30 p.m.
Product type analytic triangular UHF algebras.
Belisario Ventura*, California State University, San Bernardino
(86946143)

1:40 p.m.

Friday October 25, 1991, 2:00 p.m.5:50 p.m.
Special Session on Commutative Algebra, II
Century Theater, Memorial Union

2:00 p.m.
Algebraic varieties and their hyperplane sections.
Craig Huneke, Purdue University, West Lafayette
Bernd Ulrich*, Michigan State University
(8691302) 
2:30 p.m.
Ideals whose Hilbert function and Hilbert polynominal agree at n=1.
Judith D. Sally*, Northwestern University
(8691385) 
3:00 p.m.
On conditions which imply the invariance of the reduction exponent of an ideal.
Thomas Marley*, University of Nebraska, Lincoln
(86913128) 
3:30 p.m.
On relation type and reduction number for high powers of ideals in a commutative Noetherian ring.
Bernard Johnston*, Florida Atlantic University
D. Katz, University of Kansas
(86913127) 
4:00 p.m.
Mixed multiplicities, joint reductions, and quasiunmixed local rings.
Irena Swanson*, Purdue University, West Lafayette
(8691310) 
4:30 p.m.
The family of residue fields of a zerodimensional commutative ring.
Robert Gilmer, Florida State University
William Heinzer*, Purdue University, West Lafayette
(8691371) 
5:00 p.m.
The RiemannRoch problem.
Steven Dale Cutkosky*, University of Missouri, Columbia
V. Srinivas, T.I.F.R, India
(86913166) 
5:30 p.m.
Coefficient ideals in and blowups of a commutative Noetherian domain.
William Heinzer, Purdue University, West Lafayette
Bernard Johnston, Florida Atlantic University
David Lantz*, Colgate University
Kishor Shah, Southwest Missouri State University
(86913102)

2:00 p.m.

Friday October 25, 1991, 2:00 p.m.5:10 p.m.
Special Session on The Geometry of Equilibrium Configurations, II
Meadowlark Room, Memorial Union

2:00 p.m.
Informal Discussion 
2:40 p.m.
How to blow soap bubbles or compactness in conformally invariant variant variational problems.
Rugang Ye*, University of California, Santa Barbara
(86949168) 
3:20 p.m.
Degree 1 singularities of energy minimizing tangent maps to a bumpy sphere.
Heayong Shin*, University of Minnesota, Minneapolis
(86953147) 
4:00 p.m.
On onetoone harmonic mappings and minimal surfaces.
Friedrich Sauvigny*, University of Wisconsin, Milwaukee
(86953157) 
4:40 p.m.
The Sharp isoperimetric inequality for radically connected minimal surface space.
Jaigyoung Choe, Pohang Institute of Science and Technology, Korea
Robert Gulliver*, University of Minnesota, Minneapolis
(86953158)

2:00 p.m.

Friday October 25, 1991, 2:00 p.m.4:50 p.m.
Special Session on Algebraic Geometry, II
Dakota Ballroom, Memorial Union

2:00 p.m.
The set of line bundles with nontrivial cohomology.
Donu Arapura*, Purdue University, West Lafayette
(8693211) 
2:30 p.m.
Branched coverings of surfaces with ample cotangent bundle.
Michael J. Spurr*, East Carolina University
(8691436) 
3:00 p.m.
On the characteristic polynomial of a monodrony transformation attached to a family of curves.
Dino J. Lorenzini*, Duke University
(8691457) 
3:30 p.m.
Vanishing theorems for ideal sheaves.
Lawrence Ein*, University of Illinois, Chicago
(8691409) 
4:00 p.m.
Boundedness of Fano varieties.
Alan M. Nadel*, Massachusetts Institute of Technology
(8691417) 
4:30 p.m.
The LazarsfeldRao property on a Gorenstein variety.
Juan C. Migliore*, University of Notre Dame
Giorgio Bolondi, University of Notre Dame
(8691433)

2:00 p.m.

Friday October 25, 1991, 2:00 p.m.4:15 p.m.
Special Session on Nonlinear Wave Equations, II
University Chamber, Memorial Union

2:00 p.m.
Twodimensional periodic waves in shallow water.
Harvey Segur*, University of Colorado, Boulder
(8693563) 
2:50 p.m.
Scaling invariance and isomonodromy deformations.
Richard Beals, Yale University
D. H. Sattinger*, University of Minnesota, Minneapolis
(8693558) 
3:40 p.m.
Stability, instability, regularity and global solutions for KdVtype equations.
Jerry L. Bona*, Pennsylvania State University, University Park
(8693564)

2:00 p.m.

Friday October 25, 1991, 2:00 p.m.4:20 a.m.
Special Session on Multidimensional Complex Analysis and Operator Theory, II
Prairie Rose Room, Memorial Union

2:00 p.m.
Toeplitz operators on L^2(R^d).
Krzysztof Nowak, Washington University
Richard Rochberg*, Washington University
(8694718) 
2:30 p.m.
Hankel operators on the Bergman space of strongly pseudoconvex domains.
Huiping Li*, State University of New York, Buffalo
(86932144) 
3:00 p.m.
Progress in the theory of random Toeplitz and singular integral operators.
Paul S. Muhly*, University of Iowa
(8694712) 
3:30 p.m.
Groupoids in operator theory.
Arlan Ramsay*, University of Colorado, Boulder
(86947114) 
4:00 p.m.
Unit spaces of groupoids of Reinhardt measures.
Keren Yan*, Indiana UniversityPurdue University, Indianapolis
(8694705)

2:00 p.m.

Friday October 25, 1991, 2:00 p.m.4:20 p.m.
Special Session on Graph Theory, II
Family Life Center, Room 319, Memorial Union

2:00 p.m.
Efficient domination of the orientations of a graph.
David W. Bange*, University of WisconsinLa Crosse
Anthony E. Barkauskas, University of WisconsinLa Crosse
Linda H. Host, University of WisconsinLa Crosse
Lane H. Clark, Southern Illinois University
(8690595) 
2:30 p.m.
Efficient dominating sets in oriented trees.
David W. Bange, University of Wisconsin, La Crosse
Anthony E. Barkauskas*, University of Wisconsin, La Crosse
Linda H. Host, University of Wisconsin, La Crosse
Lane H. Clark, Southern Illinois University, Carbondale
(8690596) 
3:00 p.m.
The spanning tree enumeration problem for diagraphs.
Nathaniel Dean*, Bellcore, Morristown, New Jersey
Peter Winkler, Bellcore, Morristown, New Jersey
A. K. Kelmans, Bellcore, Morristown, New Jersey
Keh Wei Lih, Bellcore, Morristown, New Jersey
William A. Massey, Bellcore, Morristown, New Jersey
(86905130) 
3:30 p.m.
HISTs in planar and toroidal graphs.
Joan P. Hutchinson*, Macalester College
(86905145) 
4:00 p.m.
The number of multicolored spanning trees in minimum biclique decompositions.
Jiuqiang Liu, Western Michigan University
Allen Schwenk*, Western Michigan University
(86905141)

2:00 p.m.

Friday October 25, 1991, 2:00 p.m.4:50 p.m.
Special Session on Lorentz Transformations and Spacetime Geometry, II
Family Life Center, Room 320, Memorial Union

2:00 p.m.
Informal Discussion 
2:30 p.m.
The Lorentz group in the context of deformation theory.
Klaus Volpert*, Villanova University
(86917116) 
3:00 p.m.
Higher casual structures.
Geoffrey Martin*, University of Toledo
(86953133) 
3:30 p.m.
Spacetime geometry of imagery and visualization for rapidlymoving objects.
Harry Gelman*, GTE Government Systems Corporation, Masschusetts
(8698352) 
4:00 p.m.
Lines in spacetime.
Jost Hinrich Eschenburg, University of Augsburg, Germany
Gregory J. Galloway*, University of Miami
(86983101) 
4:30 p.m.
The structure of staticcomplete spacetimes.
Steven G. Harris*, Saint Louis University
(8698350)

2:00 p.m.

Friday October 25, 1991, 2:30 p.m.4:20 p.m.
Special Session on Ergodic Theory, I
Family Life Center, Room 122, Memorial Union

2:30 p.m.
A multiple parameter subsequence ergodic theorem.
Kurt Cogswell*, North Dakota State University, Fargo
(8694062) 
3:00 p.m.
Multiparameter and subsequence ergodic theorems for general operators.
James Olsen*, North Dakota State University, Fargo
(8694792) 
3:30 p.m.
Exact independence out of asymptotic independence.
I. Kornfeld*, North Dakota State University, Fargo
(8694769) 
4:00 p.m.
Applications of the CarlesonHunt theorem to ergodic theory.
Michael Lacey*, Indiana University, Bloomington
(8692880)

2:30 p.m.

Friday October 25, 1991, 2:30 p.m.5:20 p.m.
Special Session on Constrained Approximation, Theory and Algorithms, I
Family Life Center, Room 124, Memorial Union

2:30 p.m.
Constrained best approximation.
Frank Deutsch*, Pennsylvania State University, University Park
(86941106) 
3:00 p.m.
Recent progress in constrained approximation.
Joseph Ward*, Texas A\thsp\&\thsp M University, College Station
(86941110) 
3:30 p.m.
A family of natural best L_1approximants by nondecreasing functions.
David A. Legg, Indiana UniversityPurdue University, Ft.\ Wayne
Douglas W. Townsend*, Indiana UniversityPurdue University, Ft.\ Wayne
(86941109) 
4:00 p.m.
Strong uniqueness and simultaneous approximation.
Alan Egger, Idaho State University
Robert Huotari*, Idaho State University
Salem M. Sahab, King Abdulaziz University, Saudi Arabia
(86941112) 
4:30 p.m.
Constrained L_papproximation by generalized convex functions.
Vasant A. Ubhaya, North Dakota State University, Fargo
Yuesheng Xu*, North Dakota State University, Fargo
(86941111) 
5:00 p.m.
Best interpolation in a strip.
A. L. Dontchev*, Mathematical Reviews, Ann Arbor, Michigan
(86941105)

2:30 p.m.

Friday October 25, 1991, 2:30 p.m.3:40 p.m.
Session on Algebra and Combinatorics
Badland Room, Memorial Union

2:30 p.m.
Prufer nonDrings.
Alan Loper*, Ohio State University, Newark
(8691393) 
2:50 p.m.
Lie and Jordan multiplications on a commutative semigroup.
Jack M. Anderson*, South Dakota State University
(8692065) 
3:10 p.m.
Unitary  perfect integers.
Dale Woods*, University of Central Oklahoma
D. J. Boyce, University of Central Oklahoma
(8691144) 
3:30 p.m.
Strong embedding and K(5)minor.
CunQuan Zhang*, West Virginia University
(86905177)

2:30 p.m.
Saturday October 26, 1991

Saturday October 26, 1991, 7:00 a.m.9:50 a.m.
Special Session on Commutative Algebra, III
Century Theater, Memorial Union

7:00 a.m.
Powers of ideals and rational surfaces.
Anthony V. Geramita*, Queen's University
(86914126) 
7:30 a.m.
Wreath products and algebraic fundamental groups.
Shreeram S. Abhyankar*, Purdue University, West Lafayette
(8691403) 
8:00 a.m.
Additive group actions on affine space.
David R. Finston*, New Mexico State University
James K. Deveney, Virginia Commonwealth University
(8691431) 
8:30 a.m.
The cohomology of algebraic groups.
Robert M. Fossum*, University of Illinois, UrbanaChampaign
(8692094) 
9:00 a.m.
When does a characteristic p surface singularity have trivial fundamental group?
Steven Dale Cutkosky, University of Missouri, Columbia
Hema Srinivasan*, University of Missouri, Columbia
(86913167) 
9:30 a.m.
Some new Ktheoretic invariants for commutative rings.
Steven E. Landsburg*, Colorado State University
(86913139)

7:00 a.m.

Saturday October 26, 1991, 7:00 a.m.9:50 a.m.
Special Session on Lorentz Transformations and Spacetime Geometry, III
Family Life Center, Room 320, Memorial Union

7:00 a.m.
Relativity on a 3manifold and generalized Lorentz matrices.
D. K. Sen*, University of Toronto
(8698326) 
7:30 a.m.
Poisson structures on SL(n,c).
Richard Beals, Yale University
D. H. Sattinger*, University of Minnesota, Minneapolis
(8692259) 
8:00 a.m.
Reflections on Lorentz's transformations of 1892.
Frank R. Tangherlini*, College of the Holy Cross
(8698314) 
8:30 a.m.
Galilei covariant electromagnetic theory, nonrelativity of velocity, and the relativistic paradoxes.
Horst E. Wilhelm*, University of Utah
(86978154) 
9:00 a.m.
A new approach to the Compton effect.
Dan Wilkins*, University of Nebraska, Omaha
(8698399) 
9:30 a.m.
The particlewave dualism in quantum field theories as reflected in the dualism of the Galileiand Lorentz group.
F. Winterberg*, University of Nevada System, Reno, Nevada
(8698327)

7:00 a.m.

Saturday October 26, 1991, 7:20 a.m.9:50 a.m.
Special Session on The Geometry of Equilibrium Configurations, III
Meadowlark Room, Memorial Union

7:20 a.m.
Driven rotating drops: The stability of the axisymmetric family of equilibria.
Frederic P. Brulois*, California State University, Dominguez Hills
(8694966) 
8:00 a.m.
Green's identities and pendent liquid drops.
Robert Finn*, Stanford University
(86976163) 
8:40 a.m.
Harmonic maps on hyperbolic spaces.
LuenFai Tam*, University of California, Irvine
(8695878) 
9:20 a.m.
Upper bounds for eigenvalues of conformal metrics.
Nicholas Korevaar*, University of Utah
(86953148)

7:20 a.m.

Saturday October 26, 1991, 7:30 a.m.9:50 a.m.
Special Session on Nonselfadjoint Operator Albebras, III
Peace Garden, Memorial Union

7:30 a.m.
Stability for commutative subspace lattices.
David R. Larson, Texas A\thsp\&\thsp M University, College Station
David R. Pitts*, University of Nebraska, Lincoln
(86947172) 
8:00 a.m.
Mideals and operator algebras.
Timothy G. Feeman*, Villanova University
(86947124) 
8:30 a.m.
Automorphism invariant ideals of nest algebras.
John L. Orr*, University of Nebraska, Lincoln
(86947150) 
9:00 a.m.
On bimodules of nest subalgebras of von Neumann algebras.
Xingde Dai*, University of North Carolina, Charlotte
(8694798) 
9:30 a.m.
Invariant ranges in von Neuman algebras.
Don Hadwin*, University of New Hampshire
(86947123)

7:30 a.m.

Saturday October 26, 1991, 7:30 a.m.9:50 a.m.
Special Session on Multidimensional Complex Analysis and Operator Theory, III
Prairie Rose Room, Memorial Union

7:30 a.m.
Schatten ideal Hankel operators on weighted Bergman spaces on strongly pseudoconvex domains.
Marco M. Peloso*, Politecnico di Torino, Italy
(86947176) 
8:00 a.m.
Toeplitz C*algebras on pseudoconvex domains with transverse symmetries.
Norberto Salinas*, University of Kansas
(86946156) 
8:30 a.m.
Exhaustion of domains.
Akio Kodama, University of Toronto
Steven G. Krantz*, Washington University
Daowei Ma, University of Chicago
(8693201) 
9:00 a.m.
Blaschke products in several complex variables.
John P. D'Angelo*, University of Illinois, UrbanaChampaign
(8693240) 
9:30 a.m.
Degeneracy of the pairing between A^infinity and A^infinity.
David E. Barrett*, University of Michigan, Ann Arbor
(86932132)

7:30 a.m.

Saturday October 26, 1991, 7:30 a.m.9:50 a.m.
Special Session on Graph Theory, III
Family Life Center, Room 124, Memorial Union

7:30 a.m.
Interval twostep graphs.
J. Richard Lundgren*, University of Colorado, Denver
Craig Rasmussen, University of Colorado, Denver
John S. Maybee, University of Colorado, Boulder
(8690572) 
8:00 a.m.
New results and open problems in graph labelings.
Joseph A. Gallian*, University of Minnesota, Duluth
(8690597) 
8:30 a.m.
Neighborhood unions and the cycle cover number of a graph.
Guantao Chen, Memphis State University
Ronald J. Gould, Emory University
Michael S. Jacobson*, University of Louisville
Richard H. Schelp, Memphis State University
(8690528) 
9:00 a.m.
Balanced networks.
William Kocay*, University of Manitoba
Doug Stone, University of Manitoba
(8690577) 
9:30 a.m.
Old and new problems in graph theory.
Paul Erd\"os*, Hungarian Academy of Science, Hungary
(86905125)

7:30 a.m.

Saturday October 26, 1991, 8:00 a.m.9:50 a.m.
Special Session on Ergodic Theory, II
Family Life Center, Room 122, Memorial Union

8:00 a.m.
Uniform return times theorems for dynamical systems and helical transforms.
Idris Assani*, University of North Carolina, Chapel Hill
(8692887) 
8:30 a.m.
Convergence and divergence of ergodic averages.
Roger L. Jones*, DePaul University
Mate Wierdl, University of North Carolina, Chapel Hill
(8692691) 
9:00 a.m.
Quotients of actions with quasiinvariant measure.
Cesar Silva*, Williams College
Dave Witte, Williams College
(86928142) 
9:30 a.m.
On mixing homogeneous spaces.
Arkady Tempelman*, Pennsylvania State University, University Park
(86947164)

8:00 a.m.

Saturday October 26, 1991, 8:00 a.m.9:50 a.m.
Special Session on Algebraic Geometry, III
Dakota Ballroom, Memorial Union

8:00 a.m.
Set theoretic complete intersections in projective threespace.
David B. Jaffe*, University of Nebraska, Lincoln
(8691482) 
8:30 a.m.
Surfaces in G(1,P^3).
Mark W. Gross*, University of Michigan, Ann Arbor
(8691430) 
9:00 a.m.
Irreducibility of the Hilbert scheme of complex projective space curves.
Changho Keem*, Seoul National University, Korea
(8691439) 
9:30 a.m.
On the Artin approximation theorem.
Mark Spivakovsky*, University of Toronto,
(8691348)

8:00 a.m.

Saturday October 26, 1991, 8:00 a.m.9:25 a.m.
Special Session on Nonlinear Wave Equations, III
University Chamber, Memorial Union

8:00 a.m.
Blowup surfaces for a class of nonlinear wave equations.
Satyanad Kichenassamy, University of Minnesota, Minneapolis
Walter Littman*, University of Minnesota, Minneapolis
(86935117) 
8:50 a.m.
Analyticity properties of multisolitons.
Satyanad Kichenassamy*, University of Minnesota, Minneapolis
(86935129)

8:00 a.m.

Saturday October 26, 1991, 8:40 a.m.9:50 a.m.
Session on Geometry and Analysis
Badland Room, Memorial Union

8:40 a.m.
Triangular truncation and finding the norm of a Hadamard multiplier.
Carl C. Cowen, Purdue University, West Lafayette
James R. Angelos, Central Michigan University
Sivaram K. Narayan*, Purdue University
(8691570) 
9:00 a.m.
Counterexamples to a conjecture for neutral equations.
Tibor Krisztin, Bolyai Institute, Hungary
R. M. Mathsen*, North Dakota State University
Xu Yuantong, Zhongshan University, China
(8693404) 
9:20 a.m.
On the Gauss map of minimal surfaces immersed in R^n.
Min Ru*, National University of Singapore, Singapore
(8695373) 
9:40 a.m.
Jensen's inequality for the Pettis integral: A characterization of the equality case.
Fr\'ed\'eric P. Brulois*, California State University, Dominguez Hills
(8694647)

8:40 a.m.

Saturday October 26, 1991, 10:15 a.m.11:05 a.m.
Invited Address
Constant mean curvature immersions: A geometrical approach.
Century Theater, Memorial Union
Henry C. Wente*, University of Toledo
(86953137) 
Saturday October 26, 1991, 12:30 p.m.1:20 p.m.
Invited Address
Prime ideals and decompositions of modules.
Century Theater, Memorial Union
Sylvia M. Wiegand*, University of Nebraska, Lincoln
(86913118) 
Saturday October 26, 1991, 1:40 p.m.4:50 p.m.
Special Session on Nonselfadjoint Operator Albebras, IV
Peace Garden, Memorial Union

1:40 p.m.
Hereditary manifolds.
Jim Agler*, University of California at San Diego, La Jolla
(86947138) 
2:30 p.m.
Triangular and semitriangular operators.
David R. Larson*, Texas A\thsp\&\thsp M University, College Station
(86946170) 
3:00 p.m.
Invariant operator ranges and operator norm inequalities.
SingCheong Ong*, Central Michigan University
(86947119) 
3:30 p.m.
An unusual CSL algebra.
John Daughtry*, East Carolina University
(8694707) 
4:00 p.m.
Preduals of operator algebras on finite dimensional spaces.
Derek Westwood*, Wright State University, Dayton
(86946120) 
4:30 p.m.
Operator algebras induced by Nagata's principle of idealization.
Alan Lambert*, University of North Carolina, Charlotte
Thomas G. Lucas, University of North Carolina, Charlotte
(8694742)

1:40 p.m.

Saturday October 26, 1991, 2:00 p.m.4:50 p.m.
Special Session on Commutative Algebra, IV
Century Theater, Memorial Union

2:00 p.m.
Locally complete intersection homomorphisms and Quillen's conjecture on the finiteness of cotangent homology.
Luchezar L. Avramov*, Purdue University, West Lafayette
(8691355) 
2:30 p.m.
Weyman's bicomplex and stable monomial ideals.
John A. Eagon*, University of Minnesota, Minneapolis
Joel Roberts, University of Minnesota, Minneapolis
(86913121) 
3:00 p.m.
On computing standard bases.
Yonghao Ma*, University of Utah
(8691356) 
3:30 p.m.
Sections of vector bundles over affine varieties.
Satya Mandal*, University of Kansas
(8691338) 
4:00 p.m.
Serre's conjecture on intersection multiplicity.
S. P. Dutta*, University of Illinois, UrbanaChampaign
(86913159) 
4:30 p.m.
Gorenstein properties of ring homomorphisms.
Luchezar L. Avramov, Purdue University, West Lafayette
HansBj\o rn Foxby*, Matematisk Institut, University of Copenhagen, Denmark
(86913115)

2:00 p.m.

Saturday October 26, 1991, 2:00 p.m.3:20 p.m.
Special Session on Ergodic Theory, III
Family Life Center, Room 122, Memorial Union

2:00 p.m.
Using joinings to prove a generalization of the return time theorem.
Daniel Jay Rudolph*, University of Maryland, College Park
(86928100) 
2:30 p.m.
Sequence entropy and mild mixing.
Qing Zhang*, Ohio State University, Columbus
(86928134) 
3:00 p.m.
On complete convergence of moving averages.
M. B. Rao*, North Dakota State University, Fargo
(86928146)

2:00 p.m.

Saturday October 26, 1991, 2:00 p.m.5:10 p.m.
Special Session on The Geometry of Equilibrium Configurations, IV
Meadowlark Room, Memorial Union

2:00 p.m.
Hypersurfaces with prescribed mean curvature in Riemannian spaces.
Ilya J. Bakelman*, Texas A\thsp\&\thsp M University, College Station
(86935140) 
2:40 p.m.
Stability of liquid bridges between coaxial tubes.
Umadhar M. Patnaik*, University of Toledo
(86958136) 
3:20 p.m.
The geometry and analysis of extremal maps.
S. Walter Wei*, University of Oklahoma
(86953153) 
4:00 p.m.
Stability theorems for curves and application to the asymptotics of certain curvature flows.
Andrejs E. Treibergs*, University of Utah
(8695353) 
4:40 p.m.
Problem Session

2:00 p.m.

Saturday October 26, 1991, 2:00 p.m.4:50 p.m.
Special Session on Algebraic Geometry, IV
Dakota Ballroom, Memorial Union

2:00 p.m.
Colorings of planar maps and graph curves.
Rick Miranda*, Colorado State University
(8691449) 
2:30 p.m.
A qexpansion principle for families of CalabiYau manifolds.
David R. Morrison*, Duke University
(86932155) 
3:00 p.m.
Ideals as sections of projective modules.
M. P. Murthy*, University of Chicago
Satya Mandal, University of Kansas
(86913161) 
3:30 p.m.
Varieties with universal zeta functions.
Diane Meuser*, Boston University
(86911152) 
4:00 p.m.
Microlocal characterization of quasihomogeneous singularities.
Stephen S.T. Yau*, University of Illinois at Chicago
(8691474) 
4:30 p.m.
Twisted exponential sums and slopes of Frobenius for generalized hypergeometric functions.
Alan Adolphson, Oklahoma State University, Stillwater
Steven Sperber*, University of Minnesota, Minneapolis
(86914135)

2:00 p.m.

Saturday October 26, 1991, 2:00 p.m.4:50 p.m.
Special Session on Multidimensional Complex Analysis and Operator Theory, IV
Prairie Rose Room, Memorial Union

2:00 p.m.
Spectral properties of essentially normal Bergman pairs.
Raul E. Curto*, University of Iowa
(86947113) 
2:30 p.m.
Spectra of some composition operators.
Barbara D. MacCluer*, University of Richmond
Carl C. Cowen, Purdue University, West Lafayette
(8694725) 
3:00 p.m.
Index theorems for Ginvariant transversally elliptic operators.
Jeffrey Fox, State University of New York, Albany and University of Colorado, Boulder
Peter Haskell*, Virginia Polytechnic Institute and State University
(8694629) 
3:30 p.m.
Exttheory for smooth algebras.
Xiaolu Wang*, University of Maryland, College Park
(8694783) 
4:00 p.m.
Toeplitz algebras and Riemannian flows.
Efton Park*, Indiana UniversityPurdue University, Indianapolis
(8694789) 
4:30 p.m.
Secondary characteristic classes and leafwise Toeplitz operators.
Jerome Kaminker*, Indiana UniversityPurdue University, Indianapolis
(86947181)

2:00 p.m.

Saturday October 26, 1991, 2:00 p.m.4:20 p.m.
Special Session on Graph Theory, IV
Family Life Center, Room 124, Memorial Union

2:00 p.m.
My favorite problems in Ramsey theory.
R. L. Graham*, AT&T Bell Laboratories, Murray Hill, New Jersey
(8690560) 
2:30 p.m.
Graphs with Linearly bounded Ramsey numbers.
Guantao Chen, Memphis State University
R. H. Schelp*, Memphis State University
(8690561) 
3:00 p.m.
Methods for evolving useful graphs.
Geoffrey Exoo*, Indiana State University
(86905165) 
3:30 p.m.
Subgraphs of a hypercube containing no small even cycles.
Fan R. K. Chung*, Bellcore, Morristown, New Jersey
(86905160) 
4:00 p.m.
Path pariable graphs.
Ralph Faudree*, Memphis State University
(8690551)

2:00 p.m.

Saturday October 26, 1991, 2:00 p.m.4:50 p.m.
Special Session on Constrained Approximation, Theory and Algorithms, II
Family Life Center, Room 319, Memorial Union

2:00 p.m.
Constrained approximation at IMSL.
Philip Smith*, International Mathematical Statistics Library Incorporated, Houston, Texas
(86941107) 
2:30 p.m.
The Newton method for convex regression, data smoothing, and quadratic programming with bounded constraints.
Wu Li, Old Dominion University
John Swetits*, Old Dominion University
(86941108) 
3:00 p.m.
Estimation and approximation using infinite dimensional convex programs with entropy type objectives.
Jonathan M. Borwein*, University of Waterloo
(8699032) 
3:30 p.m.
A convex programming approach to constrained approximation.
Jon Borwein, University of Waterloo
Adrian Lewis*, University of Waterloo
(8694945) 
4:00 p.m.
Active set algorithms for isotonic regression.
Michael J. Best*, University of Waterloo
(86949104) 
4:30 p.m.
Generalized convex functions and best L_p approximation.
Ronald M. Mathsen, North Dakota State University, Fargo
Vasant A. Ubhaya*, North Dakota State University, Fargo
(86941103)

2:00 p.m.

Saturday October 26, 1991, 2:00 p.m.2:50 p.m.
Special Session on Lorentz Transformations and Spacetime Geometry, IV
Family Life Center, Room 320, Memorial Union

2:00 p.m.
Informal Discussion 
2:30 p.m.
Leftinvariant Lorentzian metrics on 3dimensional lie groups
Phillip E. Parker*, Wichita State University
(8695381)

2:00 p.m.