AMS Sectional Meeting Program by Day
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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)

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)

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)

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)

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)

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)

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)

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)

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)

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)

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)

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)

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)

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)

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)

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)

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)

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)

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)
Inquiries: meet@ams.org