AMS Sectional Meeting Full Program
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Program 
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Inquiries: meet@ams.org
1990 Western Section Meeting
Irvine, CA, November 1011, 1990
Meeting #862
Associate secretaries:
Lance W Small, AMS
lwsmall@ucsd.edu
Saturday November 10, 1990

Saturday November 10, 1990, 7:00 a.m.9:50 a.m.
Special Session on Interactions Between Group Theory and Geometry/Number Theory, I
Room 108, Physical Sciences I

7:00 a.m.
pAlgebras over maximally complete fields.
Bill Jacob*, University of California, Santa Barbara
(8621622)

7:30 a.m.
Kadmissibility of A_6 and A_7.
Murray Schacher*, University of California, Los Angeles
(8621223)

8:00 a.m.
Maximal subfields of division algebras over rational function fields.
Burton Fein*, Oregon State University
(8621219)

8:30 a.m.
The genus zero problem for M_24.
Geoffrey Mason*, University of California, Santa Cruz
(8622034)

9:00 a.m.
On multiplication by n in the Jacobians of hyperelliptic curves.
David G. Cantor*, University of California, Los Angeles
(8622049)

9:30 a.m.
Solvable algebras and weight vectors for group geometries.
Stephen D. Smith*, University of Illinois, Chicago
(8622025)

Saturday November 10, 1990, 7:00 a.m.9:50 a.m.
Special Session on Operator Theory/Operator Algebras, I
Room 114, Physical Sciences I

7:00 a.m.
A Hankel matrix approach to truncated moment problems.
Raul E. Curto*, University of Iowa
(8624757)

7:30 a.m.
Function algebras on Riemann surfaces and their representations: Induction and dilation.
Palle E. T. J\o rgensen*, University of Iowa
(8624689)

8:00 a.m.
Mideals and quotients of subdiagonal algebras.
Yiu Tung Poon, Iowa State University
ZhongJin Ruan*, University of Illinois, UrbanaChampaign
(8624755)

8:30 a.m.
The structure of twisted SU(3) groups.
Albert JeuLiang Sheu*, University of Kansas
(8624627)

9:00 a.m.
Properties of the Haagerup tensor product.
Roger R. Smith*, Texas A\thsp\&\thsp M University, College Station
(8624601)

9:30 a.m.
A Riesz decomposition property and its consequences.
Shuang Zhang*, University of Cincinnati
(8624606)

Saturday November 10, 1990, 7:30 a.m.9:50 a.m.
Special Session on Probability Theory in Mathematical Physics, I
Room 230, Physical Sciences Classroom Facility

7:30 a.m.
Forest fires with regrowth in D = 2.
C. Neuhauser*, University of Southern California
R. Durrett, Cornell University
(8626044)

8:00 a.m.
Hydrodynamics for totally asymmetric attractive particle system with general initial profiles.
JeanPierre Fouque*, University of California, Irvine
(8626040)

8:30 a.m.
Mathematical models of catalytic surfaces.
Eric Grannan*, AT&T Bell Laboratories, Murray Hill, New Jersey
Glen Swindle, University of California, Santa Barbara
(8626041)

9:00 a.m.
The contact process in a random environment.
Thomas M. Liggett*, University of California, Los Angeles
(8626047)

9:30 a.m.
Droplet model for autocorrelation functions in an Ising ferromagnet.
C. Tang*, University of California, Santa Barbara
H. Nakanishi, University of California, Santa Barbara
J. S. Langer, University of California, Santa Barbara
(8626043)

Saturday November 10, 1990, 8:00 a.m.9:50 a.m.
Special Session on Interactions Between Group Theory and Logic, I
Room 210, Physical Sciences Classroom Facility

8:00 a.m.
On a class of abelian pgroups.
Manfred Dugas*, Baylor University
John Irwin, Wayne State University
(8622070)

8:30 a.m.
Infinite rank Butler groups, III.
K. M. Rangaswamy*, University of Colorado, Colorado Springs
(8622010)

9:00 a.m.
A class of groups characterized by their socles.
Patrick Keef*, Whitman College
(8622083)

9:30 a.m.
Superstable differential fields.
\v Zeljko Sokolovi\'c*, University of Notre Dame
(8620374)

Saturday November 10, 1990, 8:00 a.m.9:50 a.m.
Special Session on Geometric P.D.E.'s: Mean and Scalar Curvature Problems, I
Room 158, Physical Sciences I

8:00 a.m.
Harmonic maps on noncompact manifolds.
Peter Li, University of Arizona
LuenFai Tam*, University of California, Irvine
(8625352)

8:40 a.m.
Mean curvature evolution and front movement for the bistable equation.
L. C. Evans*, University of California, Berkeley
(8623586)

9:20 a.m.
Curvaturedependent motion of curves and surfaces.
J. A. Sethian*, University of California, Berkeley
(8623533)

Saturday November 10, 1990, 10:00 a.m.10:50 a.m.
Invited Address
Parameter spaces in the inverse Galois problem.
0, Physical Sciences Lecture Hall
Michael D. Fried*, University of California, Irvine
(8621212)

Saturday November 10, 1990, 1:00 p.m.3:30 p.m.
Special Session on Interactions Between Group Theory and Logic, II
Room 210, Physical Sciences Classroom Facility

1:00 p.m.
Involutions in groups of finite Morley rank.
Alexandre Borovik*, Omsk University, USSR and University of California, Irvine
(8622009)

1:30 p.m.
Model theory of Lie algebras.
Richard Rosengarden*, Rutgers University, New Brunswick
(8620377)

2:00 p.m.
The cohomological dimension of locally finite groups.
Peter Kropholler, Queen Mary College, England
Simon Thomas*, Rutgers University, New Brunswick
(8622096)

2:30 p.m.
Arities of finite permutation groups.
Gary A. Martin*, Southeastern Massachusetts University
Gregory Cherlin, Rutgers University, New Brunswick
(8622059)

3:00 p.m.
Discussion

Saturday November 10, 1990, 1:00 p.m.2:20 p.m.
Special Session on Interactions Between Group Theory and Geometry/Number Theory, II
Room 108, Physical Sciences I

1:00 p.m.
Fixedpoint ratios for finite groups.
Michael Aschbacher*, California Institute of Technology
(8622060)

1:30 p.m.
Extensions of simple modules for SL_3(2^n), SU_3(2^n), Sp_4(2^n) and Sz(2^m).
Peter Sin*, University of Florida
(8622048)

2:00 p.m.
Some examples of infinite Frobenius groups.
Michael J. Collins*, California Institute of Technology
(8622030)

Saturday November 10, 1990, 1:00 p.m.4:00 p.m.
Special Session on Quantum and Statistical Mechanics, I
Room 230, Physical Sciences Classroom Facility

1:00 p.m.
Droplet shape, droplet condensation and large deviation estimates.
Senya Shlosman*, Academy of Science of the USSR
(8628266)

1:30 p.m.
Effects of static disorder in statistical mechanics.
Jan Wehr*, Institute for Advanced Study
(8628268)

2:00 p.m.
One dimensional Anderson models in the weak disorder limit.
Athanasios Speis*, University of Michigan
(8628167)

2:30 p.m.
OrsteinZernike decay in the ground state of the Ising model in a strong transverse field.
Tom Kennedy*, University of Arizona
(8628273)

3:00 p.m.
Quantum spin systems with disorder.
Abel Klein*, University of California, Irvine
(8628263)

3:30 p.m.
Discussion

Saturday November 10, 1990, 1:00 p.m.4:50 p.m.
Special Session on Operator Theory/Operator Algebras, II
Room 114, Physical Sciences I

1:00 p.m.
Facial structure in operator algebra theory.
Charles A. Akemann*, University of California, Santa Barbara
Gert K. Pedersen, Matematisk Institut, Denmark
(8624605)

1:30 p.m.
Algebras associated with sets of semigroups of isometries.
William Arveson*, University of California, Berkeley
(8624691)

2:00 p.m.
Projective tensor products for operator spaces and noncommutative coactions.
Edward Effros*, University of California, Los Angeles
ZhongJin Ruan, University of Illinois, UrbanaChampaign
(8624693)

2:30 p.m.
A dense set of operators with tiny commutants.
Domingo A. Herrero*, Arizona State University
(8624703)

3:00 p.m.
The derived tower of certain type III_lambda inclusions of index 4.
Phan H. Loi*, University of California, Los Angeles
(8624604)

3:30 p.m.
C^*algebras generated by the elements of a unitary matrix.
Kevin P. McClanahan*, University of California, Los Angeles
(8624690)

4:00 p.m.
Almost multiplicative maps between operator algebras.
Barry E. Johnson*, University of Newcastle Upon Tyne, England
(8624687)

4:30 p.m.
Cohomology for operator algebras.
Frank L. Gilfeather*, University of New Mexico
(86247100)

Saturday November 10, 1990, 1:00 p.m.3:30 p.m.
Special Session on Geometric P.D.E.'s: Mean and Scalar Curvature Problems, II
Room 158, Physical Sciences I

1:00 p.m.
Recent results on scalar curvature.
R. Schoen*, Stanford University
(8625350)

1:40 p.m.
Higher order conformal invariants on S^n.
SunYung A. Chang*, University of California, Los Angeles
(8625385)

2:20 p.m.
The singular Yamabe problem on the sphere.
Rafe Mazzeo*, Stanford University
Nat Smale, University of Utah
(8625351)

3:00 p.m.
Gaussian curvature on S^2rotationally symmetric case.
Xingwang Xu*, University of California, Los Angeles
(8625381)

Saturday November 10, 1990, 2:30 p.m.5:20 p.m.
Special Session on Moduli Space Applications, I
Room 108, Physical Sciences I

2:30 p.m.
Extensions of number fields arising from branched coverings.
Sybilla Beckmann*, University of Georgia
(8621417)

3:00 p.m.
Universal CayleyHamilton algebras.
Zinovy Reichstein*, Mathematical Sciences Research Institute, Berkeley
(86214101)

3:30 p.m.
Canonical bundle and deformations.
Ziv Ran*, University of California, Riverside
(8621435)

4:00 p.m.
Vanishing theorems and the equations defining projective varieties.
Robert Lazarsfeld*, University of California, Los Angeles
(8621428)

4:30 p.m.
Curves as Hurwitz spaces.
David Harbater*, University of Pennsylvania
(8621415)

5:00 p.m.
Singular hyperbolic structures.
Steve Kerckhoff*, Stanford University
(8625816)
Sunday November 11, 1990

Sunday November 11, 1990, 7:00 a.m.9:50 a.m.
Special Session on Interactions Between Group Theory and Geometry/Number Theory, III
Room 108, Physical Sciences I

7:00 a.m.
Planar difference sets and multipliers.
Chat Y. Ho*, University of Florida
(8622053)

7:30 a.m.
On monodromy groups of fixed genus.
Michael G. Neubauer*, University of Texas, Austin
(8622056)

8:00 a.m.
Central extensions as Galois groups.
H. V\"olklein*, University of Florida
(8621121)

8:30 a.m.
Disconnected groups of Lie type as Galois groups.
Gunter Malle*, IWR, Federal Republic of Germany
(8622020)

9:00 a.m.
Algebraic fundamental groups.
Shreeram S. Abhyankar*, Purdue University, West Lafayette
(8621418)

9:30 a.m.
Kloosterman sums for Chevalley groups.
Romuald D\c abrowski*, Indiana University, Bloomington
(8622024)

Sunday November 11, 1990, 7:00 a.m.9:50 a.m.
Special Session on Operator Theory/Operator Algebras, III
Room 114, Physical Sciences I

7:00 a.m.
Surjective isometries of real C^*algebras.
ChoHo Chu, University of London, England
Truong Dang*, Irvine, CA
Bernard Russo, University of California, Irvine
Belisario Ventura, California State University, San Bernardino
(8624692)

7:30 a.m.
How many exponentials?
N. Christopher Phillips*, University of Oregon
(8624602)

8:00 a.m.
Analyticity in triangular UHF algebras.
Baruch Solel, University of Haifa, Israel
Belisario A. Ventura*, California State University, San Bernardino
(8624688)

8:30 a.m.
Triangular AF algebras.
Alan Hopenwasser*, University of Alabama, Tuscaloosa
(8624708)

9:00 a.m.
Duality and harmonic analysis for groups, hypergroups, and groupoids.
Martin E. Walter*, University of Colorado, Boulder
(8624397)

9:30 a.m.
Geometric characterization of B(H,K).
Yaakov Friedman, Jerusalem College of Technology, Israel
Bernard Russo*, University of California, Irvine
(8624694)

Sunday November 11, 1990, 7:00 a.m.9:50 a.m.
General Session
Room 240, Physical Sciences I

7:00 a.m.
Generalized integral Iwasawa and BruhatSteinberg decompositions for semisimple groups.
Yevsey Nisnevich*, Johns Hopkins University
(8621158)

7:20 a.m.
On differential algebraic groups.
Anand Pillay, University of Notre Dame
\v Zeljko Sokolovi\'c*, University of Notre Dame
(8620362)

7:40 a.m.
Certain ToddCoxeter approximations and universal covers of 3manifolds.
John R. Stallings*, University of California, Berkeley
(8622011)

8:00 a.m.
Counting subgroups of given index and orbit structure in free groups.
Reinhard O. W. Franz*, University of Bielefeld, Federal Republic of Germany
(8622079)

8:20 a.m.
Generalized translational spaces.
C. R. Giardina*, City College, City University of New York
(8629469)

8:40 a.m.
Conditioning infinitely monotone capacities.
Carl G. Wagner*, University of Tennessee, Knoxville
(8626007)

9:00 a.m.
Transient solutions of the M/M/1 queueing system using Taylor series.
Alan Krinik*, California Polytechnic State University
(8626054)

9:20 a.m.
A fdistance property of dsymbol aperiodic sequences arising from a cutandproject method.
Ramin Vakilian*, University of California, Davis
(8628271)

9:40 a.m.
Information, complexity and meaning
Ben Goertzel*, University of Nevada, Las Vegas
(8626895)

Sunday November 11, 1990, 7:30 a.m.9:50 a.m.
Special Session on Geometric P.D.E.'s: Mean and Scalar Curvature Problems, III
Room 158, Physical Sciences I

7:30 a.m.
Discussion

8:00 a.m.
Minimal submanifolds with isolated singularities.
N. Smale*, University of Utah
(8623580)

8:40 a.m.
Conformal deformation of metrics to constant mean curvature.
Jos\'e F. Escobar*, Indiana University, Bloomington
(8625398)

9:20 a.m.
Existence of the general constant mean curvature torus.
N. Ercolani*, University of Arizona
H. Knorrer, Eidgen\"ossische Technische Hochschule, Switzerland
E. Trubowitz, Eidgen\"ossische Technische Hochschule, Switzerland
(8625384)

Sunday November 11, 1990, 8:00 a.m.9:50 a.m.
Special Session on Interactions Between Group Theory and Logic, III
Room 210, Physical Sciences Classroom Facility

8:00 a.m.
Solvable groups of finite Morley rank.
LuisJaime Corredor*, University of California, Irvine
(8622078)

8:30 a.m.
Groups and long EhrenfeuchtFraisse games.
Alan H. Mekler*, Simon Fraser University
(8620376)

9:00 a.m.
The generalized Saffe condition.
Ivo Herzog*, University of California, Irvine
(8620375)

9:30 a.m.
Finite matrix groups and representation theory of artinian rings.
Birge Zimmermann Huisgen*, University of Utah
(8621626)

Sunday November 11, 1990, 8:00 a.m.9:50 a.m.
Special Session on Probability Theory in Mathematical Physics, II
Room 230, Physical Sciences Classroom Facility

8:00 a.m.
Symmetry and change of measure.
Joe Watkins*, University of Southern California
(8626039)

8:30 a.m.
Random laws for stationary processes.
Kenneth S. Alexander*, University of Southern California
Steven A. Kalikow, University of Southern California
(8626045)

9:00 a.m.
Continuity of the percolation transition.
David Barsky*, University of California, Davis
(8626046)

9:30 a.m.
Quantum sticky spheres and Bessel bridges.
Mathew Penrose*, University of California, Santa Barbara
O. Penrose, University of California, Santa Barbara
G. Stell, University of California, Santa Barbara
R. Pemantle, University of California, Santa Barbara
(8626042)

Sunday November 11, 1990, 10:00 a.m.10:50 a.m.
Invited Address
Nature of the critical phenomenon in selforganized criticality.
0, Physical Sciences Lecture Hall
Jennifer T. Chayes*, University of California, Los Angeles
(86260102)

Sunday November 11, 1990, 1:00 p.m.1:50 p.m.
Invited Address

Sunday November 11, 1990, 2:00 p.m.4:20 p.m.
Special Session on Quantum and Statistical Mechanics, II
Room 230, Physical Sciences Classroom Facility

2:00 p.m.
Finite size scaling behavior of a biased majority rule cellular automation.
Roberto H. Schonmann*, University of California, Los Angeles
(8628265)

2:30 p.m.
Stability of a selforganizing process.
William G. Faris*, University of Arizona
(8628272)

3:00 p.m.
Renormalizations and thermodynamic formalism.
Konstantin M. Khanin*, Academy of Science of the USSR
(8628264)

3:30 p.m.
Taufunctions and isomonodromy.
Craig A. Tracy*, University of California, Davis
(8623599)

4:00 p.m.
Essential selfadjointness of relativistic Schrodinger operators: Path integral methods.
Rene Carmona*, University of California, Irvine
(8628161)

Sunday November 11, 1990, 2:00 p.m.4:30 p.m.
Special Session on Geometric P.D.E.'s: Mean and Scalar Curvature Problems, IV
Room 158, Physical Sciences I

2:00 p.m.
The pendent liquid drop.
Robert Finn*, Stanford University
(8623538)

2:40 p.m.
The structure of the space of complete embedded minimal surfaces of finite topology.
David Hoffman*, University of Massachusetts, Amherst
(8625382)

3:20 p.m.
Embedded minimal surfaces and quadratic area growth.
Robert B. Kusner*, University of Massachusetts, Amherst
William H. Meeks, III, University of Massachusetts, Amherst
(8625336)

4:00 p.m.
The Gauss map of constant mean curvature surfaces of Minkowski space.
H. I. Choi, University of Iowa
Andrejs E. Treibergs*, University of Utah
(8625337)

Sunday November 11, 1990, 2:00 p.m.4:20 p.m.
Special Session on Moduli Space Applications, II
Room 108, Physical Sciences I

2:00 p.m.
Circle packings as moduli for Riemann surfaces.
Robert Brooks*, University of Southern California
(8622214)

2:30 p.m.
On the Hilbert scheme of codimension 2 subvarieties.
MeiChu Chang*, University of California, Riverside
(8621431)

3:00 p.m.
Diffeomorphism types of varieties.
Robert Friedman*, Columbia University
(8621432)

3:30 p.m.
Moduli of rational double points and small resolutions.
Sheldon Katz*, Oklahoma State University, Stillwater
David R. Morrison, Duke University
(8621429)

4:00 p.m.
A new super KP system and a characterization of the Jacobians of arbitrary algebraic super curves.
Motohico Mulase*, University of California, Davis
(8622213)
Inquiries: meet@ams.org