AMS Sectional Meeting Full Program
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1990 Central Section Meeting
Manhattan, KS, March 1617, 1990
Meeting #855
Associate secretaries:
Andy R Magid, AMS
amagid@ou.edu
Friday March 16, 1990

Friday March 16, 1990, 7:30 a.m.9:50 a.m.
Special Session on Geometric Function Theory, I
Room 144, Cardwell Hall

7:30 a.m.
The maximum modulus and characteristic.
David Drasin*, Purdue University, West Lafayette
(85530200)

8:00 a.m.
Estimates for sets where a meromorphic function is large.
Matts Essen, Uppsala Universirt, Sweden
John Rossi, Virginia Polytechnic Institute and State University
Daniel Shea*, University of Wisconsin, Madison
(85530193)

8:30 a.m.
An application of the spread relation to algebraic differential equations.
Gary G. Gundersen*, University of New Orleans
(85534138)

9:00 a.m.
On an L^2 inequality involving entire functions of exponential type.
LiChien Shen*, University of Florida
(85530137)

9:30 a.m.
Stochastic Loewner equation.
David Rochberg, Washington University
Richard Rochberg*, Washington University
(85530139)

Friday March 16, 1990, 7:30 a.m.9:50 a.m.
Special Session on Inverse Problems and Scattering Theory, I
Room 143, Cardwell Hall

7:30 a.m.
Efficient numerical methods for solving inverse problems of PDE.
Y. M. Chen*, State University of New York, Stony Brook
(8556502)

8:20 a.m.
Recovery of coefficients in first order hyperbolic equations.
Michael Pilant, Texas A & M University, College Station
William Rundell*, Texas A & M University, College Station
(8553573)

9:10 a.m.
An iterative method for onedimensional second order inverse spectral problems.
William Rundell, Texas A & M University, College Station
Paul E. Sacks*, Iowa State University
(8553572)

Friday March 16, 1990, 8:00 a.m.9:50 a.m.
Special Session on Harmonic Analysis and Probability Theory, I
Room 131, Cardwell Hall

8:00 a.m.
Martingale transforms and paraproducts.
J.A. Chao*, Cleveland State University
R.L. Long, Academia Sinica, People's Republic of China
(8556051)

8:30 a.m.
Conformal geometry, Sobolev inequalities and symmetrization.
William Beckner*, University of Texas, Austin
(8554269)

9:00 a.m.
Fractional integration on tail sigmafields.
Andrew G. Bennett*, Kansas State University
(85560109)

9:30 a.m.
Superadditivity of Fisher's information and logarithmic Sobolev inequalities.
Eric A. Carlen*, Princeton University
(85562170)

Friday March 16, 1990, 8:00 a.m.9:50 a.m.
Special Session on Orthostructures, I
Room 121, Cardwell Hall

8:00 a.m.
A sheaf representation theorem for Baer and Rickart rings.
Douglas G. Burkholder, Wichita State University
Gary D. Crown*, Wichita State University
(85516161)

8:30 a.m.
Graph theoretic properties in the context of orthomodular theory.
Gerald Schrag*, Central Missouri State University
Larry Cammack, Central Missouri State University
(85506185)

9:00 a.m.
On states and generalized state spaces of the generalizations of the Greechie lattice.
Larry Cammack*, Central Missouri State University
Gerald Schrag, Central Missouri State University
(85506187)

9:30 a.m.
Computational systems for research on orthostructures.
William David Miller*, Oklahoma State University, Stillwater
(85568196)

Friday March 16, 1990, 8:00 a.m.9:50 a.m.
Special Session on Partial Differential Equations, I
Room 129, Cardwell Hall

8:00 a.m.
Leastenergy solutions to a semilinear Neumann problem related to biological pattern formation.
Izumi Takagi*, Tohoku University, Japan
(85535188)

8:30 a.m.
Spatially degenerate nonlinear diffusion with drift and the Wentzel boundary condition.
Jerome A. Goldstein*, Tulane University
ChinYuan Lin, Texas A\thsp\&\thsp M University, College Station
(85535118)

9:00 a.m.
Stability and Hopf bifurcation of solutions of the Dirichlet problem for diffusive predatorprey systems.
Robert Gardner*, University of Massachusetts, Amherst
(8553543)

9:30 a.m.
A quasilinear parabolic problem in one space dimension.
J. R. Dorroh, Louisiana State University, Baton Rouge
Gisele Ruiz Rieder*, Louisiana State University, Baton Rouge
(85535191)

Friday March 16, 1990, 8:00 a.m.9:50 a.m.
Special Session on Commutative Algebra, I
Room 102, Cardwell Hall

8:00 a.m.
Galois theory on the line.
Shreeram S. Abhyankar*, Purdue University, West Lafayette
(8551407)

8:30 a.m.
Finite generation of monoids of fractional ideals.
D. D. Anderson*, University of Iowa
(8551312)

9:00 a.m.
Intersection multiplicity of modules.
Sankar Prasad Dutta*, University of Illinois, UrbanaChampaign
(85513146)

9:30 a.m.
Finite phantom projective dimension.
Ian M. Aberbach*, University of Michigan, Ann Arbor
(8551395)

Friday March 16, 1990, 8:00 a.m.9:50 a.m.
Special Session on Ergodic Theory, I
Room 130, Cardwell Hall

8:00 a.m.
Ergodic theorems for subsequences and moving averages.
Roger L. Jones*, DePaul University
(8554274)

8:30 a.m.
A maximal inequality and its consequences in ergodic theory.
J. Rosenblatt, Ohio State University, Columbus
M. Wierdl*, Ohio State University, Columbus
(85528179)

9:00 a.m.
On induced operators.
R. E. Bradley*, Northwestern University
(8552837)

9:30 a.m.
Failure of the WienerWintner property for the helical transform in L^1.
Idris Assani*, University of North Carolina, Chapel Hill
(8552839)

Friday March 16, 1990, 8:00 a.m.9:50 a.m.
Special Session on Graph Theory, I
Room 146, Cardwell Hall

8:00 a.m.
Coloring tournaments.
Kunwarjit S. Bagga, Ball State University
Lowell W. Beineke*, Indiana UniversityPurdue University, Ft.\ Wayne
Frank Harary, New Mexico State University, Las Cruces
(85505114)

8:30 a.m.
A combinatorial approach to the integral multicommodity flow problem with application to the packed routing.
F. Shahrokhi, North Texas University
L. A. Sz\'ekely*, University of New Mexico
(8550548)

9:00 a.m.
kgraphs with uniformly distributed subgraphs.
F. R. K. Chung, Bell Communications Research, Morristown, NJ
R. L. Graham*, AT&T Bell Laboratories, Murray Hill, New Jersey
(8550587)

9:30 a.m.
Quasirandom classes of hypergraphs.
Fan R. K. Chung*, Bellcore, Morristown, New Jersey
(85505113)

Friday March 16, 1990, 8:00 a.m.9:50 a.m.
Special Session on Groups and Geometries, I
Room 145, Cardwell Hall

8:00 a.m.
Extending morphisms of groups and graphs.
Michael Aschbacher*, California Institute of Technology
Yoav Segev, Ben Gurion University, Israel
(85520152)

8:30 a.m.
A Cayley integer approach to the Leech lattice.
George Glauberman*, University of Chicago
(8552049)

9:00 a.m.
Applications of algebraic curves to the representation theory of SL_2.
Geoffrey Mason*, University of California, Santa Cruz
(8552018)

9:30 a.m.
Sharply transitive linear groups over algebraically closed fields.
G. Cherlin, Rutgers University, New Brunswick
T. Grundh\"ofer, University T\"ubingen, Federal Republic of Germany
A. Nesin, University of California, Irvine
H. Voelklein*, University of Florida
(8552040)

Friday March 16, 1990, 8:00 a.m.9:50 a.m.
Special Session on Applications of Category Theory, I
Room 103, Cardwell Hall

8:00 a.m.
Categorysorted algebra and its applications.
David A. Schmidt*, Kansas State University
(8551896)

8:30 a.m.
Compact pairs and generalized perfect maps.
Eraldo Giuli*, Universit\`a degli Studi di L'Aquila, Italy
(8551831)

9:00 a.m.
Groups of dualities.
Georgi D. Dimov, Bulgarian Academy of Sciences, Bulgaria
Walter Tholen*, York University
(8551829)

9:30 a.m.
Internal description of hulls.
Friedhelm Schwarz, University of Toledo
Sibylle WeckSchwarz*, University of Toledo
(8551886)

Friday March 16, 1990, 8:00 a.m.9:30 a.m.
Session on Algebra
Room 120, Cardwell Hall

8:00 a.m.
Rings of integervalued polynomials over semilocal PID's.
Jim Brewer*, Florida Atlantic University
Lee Klingler, Florida Atlantic University
(8551352)

8:20 a.m.
The Picard group for the commutative ring theorist.
F. W. Call*, University of Michigan, Ann Arbor
R. Heitmann, University of Texas, Austin
(8551324)

8:40 a.m.
Gr\"obner bases and automorphisms of polynomial ring.
Wei Li*, Purdue University, West Lafayette
(8551308)

9:00 a.m.
Infinitesimal extensions of glued varieties.
Khomo T. S. Mohapeloa*, Pennsylvania State University, McKeesport, PA
(85514183)

9:20 a.m.
On an extremal problem in the Bloch space.
Flavia Colonna*, George Mason University
(8553089)

Friday March 16, 1990, 10:00 a.m.11:00 a.m.
Invited Address
Modular forms and the Riemann zetafunction.
Room 101, Cardwell Hall
J. Brian Conrey*, Oklahoma State University
(85511173)

Friday March 16, 1990, 12:30 p.m.1:30 p.m.
Invited Address
Representation theory and stable homotopy of finite groups.
Room 101, Cardwell Hall
Stewart B. Priddy*, Northwestern University
(85555184)

Friday March 16, 1990, 2:00 p.m.4:50 p.m.
Special Session on Harmonic Analysis and Probability Theory, II
Room 131, Cardwell Hall

2:00 p.m.
Intrinsic ultracontractivity and eigenfuction estimates for the Schrodinger operators.
Rodrigo Ba\~nuelos*, Purdue University, West Lafayette
(8553136)

2:30 p.m.
Distribution function inequalities for the density of the area integral.
Rodrigo Ba\~nuelos, Purdue University, West Lafayette
Charles Moore*, Purdue University, West Lafayette
(85531141)

3:00 p.m.
On the almost sure behavior of sums of iid random variables in Hilbert space.
Uwe Einmahl*, Indiana University, Bloomington
(8556068)

3:30 p.m.
On weak convergence in dynamical systems to selfsimilar processes.
Michael Lacey*, Indiana University, Bloomington
(8556054)

4:00 p.m.
Ergodic averages on spheres.
Roger L. Jones*, DePaul University
(8554270)

4:30 p.m.
Almost everywhere convergence of convolution powers.
A. Bellow, Northwestern University
R. Jones, DePaul University
Joseph Rosenblatt*, Ohio State University, Columbus
(85560157)

Friday March 16, 1990, 2:00 p.m.4:20 p.m.
Special Session on Orthostructures, II
Room 121, Cardwell Hall

2:00 p.m.
Filters in orthoalgebras and their relationship to supports in test spaces.
Andrew S. Golfin, Jr.*, Gettysburg College
(85506163)

2:30 p.m.
Coupled entities.
David J. Foulis*, University of Massachusetts, Amherst
(85581162)

3:00 p.m.
Refinement and unique Mackey decomposition for manuals and orthoalgebras.
Matthew B. Younce*, Rhode Island College
(8550656)

3:30 p.m.
sigmamanuals.
Alexander Wilce*, University of New Hampshire
(85506160)

4:00 p.m.
Convergence of observables on quantum logics.
Stanley Gudder*, University of Denver
(8550603)

Friday March 16, 1990, 2:00 p.m.4:20 p.m.
Special Session on Numerical Analysis, I
Room 122, Cardwell Hall

2:00 p.m.
Vortex dynamics of hovering mode.
Karl Gustafson*, University of Colorado, Boulder
(8556505)

2:30 p.m.
Quasimolecular fluid modeling.
Donald Greenspan*, University of Texas, Arlington
(8556578)

3:00 p.m.
LyapunovSchmidt reduction for the crossing of two neutral curves in TaylorCouette flow.
John H. Bolstad*, University of California, Livermore
Michael E. Henderson, IBM T. J. Watson Research Center, Yorktown Heights, New York
(8556577)

3:30 p.m.
Bifurcation of periodic solutions of singularly perturbed delay differential equation.
Abdullah J. Tamraz*, Wichita State University
(85565128)

4:00 p.m.
Numerical computation of water waves in a potential flow.
C. H. Su*, Brown University
(8556576)

Friday March 16, 1990, 2:00 p.m.5:20 p.m.
Special Session on Geometric Function Theory, II
Room 144, Cardwell Hall

2:00 p.m.
On some almost everywhere overdetermined boundary value problems.
John Lewis*, University of Kentucky
Andrew Vogel, University of Kentucky
(8553122)

2:30 p.m.
Note on A_infinity and level sets of conformal mappings.
Juha Heinonen*, University of Michigan, Ann Arbor
(85530102)

3:00 p.m.
The Dirichlet problem for the infinityLaplacian.
Tilak Bhattacharya, Northwestern University
Emanuelle DiBenedetto, Northwestern University
Juan Manfredi*, University of Pittsburgh, Pittsburgh
(85535116)

3:30 p.m.
Composition operators and angular derivatives.
Tom Carroll*, Purdue University, West Lafayette
(85530140)

4:00 p.m.
Discrete quasiconformal groups with small dilatation.
M. Jean McKemie*, St. Edward's University
(8553094)

4:30 p.m.
Boundary values for some classes of functions.
Enrique Villamor*, Florida International University
(85530115)

5:00 p.m.
Generalised conformal welding.
David H. Hamilton*, University of Maryland, College Park
(8553057)

Friday March 16, 1990, 2:00 p.m.4:50 p.m.
Special Session on Partial Differential Equations, II
Room 129, Cardwell Hall

2:00 p.m.
A RiemannLebesque lemma for mathematical ecology.
Robert Stephen Cantrell*, University of Miami
Chris Cosner, University of Miami
(85535125)

2:30 p.m.
Positive solutions of systems of nonlinear eigenvalue problems.
Nela Lako\v s*, Ohio State University, Columbus
(85535182)

3:00 p.m.
Minimal solutions of superlinear equations.
Allan Edelson*, University of California, Davis
(85535194)

3:30 p.m.
Semilinear elliptic problems at resonance  some space dimension dependent results.
Renate Schaaf*, University of Utah
Klaus Schmitt, University of Utah
(85535100)

4:00 p.m.
Towards a theory for quasilinear PDEs in structured population dynamics.
Horst R. Thieme*, Arizona State University
(85535199)

4:30 p.m.
Rearrangements and vorticity.
Alan Elcrat*, Wichita State University
Kenneth Miller, Wichita State University
(8553484)

Friday March 16, 1990, 2:00 p.m.4:50 p.m.
Special Session on Commutative Algebra, II
Room 102, Cardwell Hall

2:00 p.m.
Curve singularities of finite CohenMacaulay type.
Roger Wiegand*, University of Nebraska, Lincoln
(85513197)

2:30 p.m.
Local cohomology of Rees algebras and Hilbert functions.
Bernard Johnston*, Louisiana State University, Baton Rouge
Jugal Verma, Louisiana State University, Baton Rouge
(85513144)

3:00 p.m.
Modules with linear syzygies.
David Eisenbud, Brandeis University
Jee Koh*, Indiana University, Bloomington
(85513143)

3:30 p.m.
Etale cohomology and the topology of algebraic varieties.
Gennady Lyubeznik*, University of Chicago
(85514142)

4:00 p.m.
Unmixed local rings of type two are CohenMacaulay.
Thomas Marley*, University of Nebraska, Lincoln
(85513176)

4:30 p.m.
Canonical resolution of hypersurface singularities of characteristic zero.
T. T. Moh*, Purdue University, West Lafayette
(85513177)

Friday March 16, 1990, 2:00 p.m.4:30 p.m.
Special Session on Inverse Problems and Scattering Theory, II
Room 143, Cardwell Hall

2:00 p.m.
Inverse scattering at fixed energy in three dimensions.
A. G. Ramm*, University of Kansas
(8553527)

2:55 p.m.
Two inverse problems for partial differential equations.
Mikhail V. Klibanov*, Courant Institute of Mathematical Sciences, New York University
(8553563)

3:50 p.m.
Clifford Tori and overdetermined problems.
Carlos Berenstein*, University of Maryland, College Park
Max Karlovitz, University of Maryland, College Park
(8553560)

Friday March 16, 1990, 2:00 p.m.4:20 p.m.
Special Session on Ergodic Theory, II
Room 130, Cardwell Hall

2:00 p.m.
Cayley graphs and recurrence in dynamical systems.
Alan Forrest*, Ohio State University, Columbus
(8552838)

2:30 p.m.
Some remarks on the convergence of weighted ergodic averages.
I. Kornfeld*, North Dakota State University
(85528149)

3:00 p.m.
Random sampling of stationary processes.
Karl Petersen*, University of North Carolina, Chapel Hill
(8552862)

3:30 p.m.
On almost everywhere convergence of convolution powers in L^1(X).
Karin ReinholdLarsson*, Ohio State University, Columbus
(85528148)

4:00 p.m.
Two applications of a theorem on invariant measures for multiplication.
Daniel J. Rudolph*, University of Maryland, College Park
(85528181)

Friday March 16, 1990, 2:00 p.m.4:20 p.m.
Special Session on Graph Theory, II
Room 146, Cardwell Hall

2:00 p.m.
Unavoidable subgraphs of sparse graphs: Lagniappe.
C. A. Barefoot, University of New Mexico
L. H. Clark, University of New Mexico
R. C. Entringer*, University of New Mexico
A. A. Kooshesh, University of New Mexico
L. A. Sz\'ekely, University of New Mexico
(8550575)

2:30 p.m.
Homomorphisms with the lifting property.
Bennet Manvel*, Colorado State University
Richard Osborne, Colorado State University
(8550593)

3:00 p.m.
A prime number theorem for normed graphs.
Robin J. Wilson*, Open University, England
(85505112)

3:30 p.m.
Size and independence in trianglefree graphs with fixed maximum degree.
Kathryn F. Jones*, University of Colorado
(8550588)

4:00 p.m.
An upper bound for the average number of regions.
Saul Stahl*, University of Kansas
(8550521)

Friday March 16, 1990, 2:00 p.m.3:50 p.m.
Special Session on Groups and Geometries, II
Room 145, Cardwell Hall

2:00 p.m.
Highweight modules for quotients of affine buildings.
Stephen D. Smith*, University of Illinois, Chicago
(8552011)

2:30 p.m.
Ru less < E_7(5).
Ulrich Meierfrankenfeld*, Michigan State University
(85520159)

3:00 p.m.
Groups generated by 3transpositions.
Jonathan I. Hall*, Michigan State University
(85520107)

3:30 p.m.
Informal Discussion

Friday March 16, 1990, 2:00 p.m.4:20 p.m.
Special Session on Applications of Category Theory, II
Room 103, Cardwell Hall

2:00 p.m.
Categorical foundations and set theory.
Saunders Mac Lane*, University of Chicago
(8551815)

2:30 p.m.
Does anybody really know what a Hopf algebra is?
Robert Pare*, Dalhousie University
(8551842)

3:00 p.m.
Metatheory of Boolean categories.
Ernest G. Manes*, University of Massachusetts, Amherst
(8551835)

3:30 p.m.
Weak adjunctions between categories of CPO's.
Michael W. Mislove, Tulane University
Frank J. Oles*, University of Pennsylvania and IBM T. J. Watson Research Center, Yorktown Heights, New York
(85568127)

4:00 p.m.
Completions of continuous posets and modules of concurrency.
Michael W. Mislove*, Tulane University
(85568192)

Friday March 16, 1990, 2:00 p.m.3:30 p.m.
General Session
Room 120, Cardwell Hall

2:00 p.m.
The value of certain determinants with elements zero and one.
Dale Woods*, Central State University
D. J. Boyce, Central State University
(85515136)

2:20 p.m.
Total cosine of normal matrices.
Morteza Seddighin*, Panhandle State University
(85515147)

2:40 p.m.
Expansions of chromatic polynomials and logconcavity.
Francesco Brenti*, University of Michigan, Ann Arbor
(8550541)

3:00 p.m.
An inverse convolution method for regular parabolic equations.
B. A. Mair*, University of Florida
D. S. Gilliam, Texas Tech University
C. F. Martin, Texas Tech University
(8553545)

3:20 p.m.
Badug tablet.
Myungkark Park*, Prompter Publications, Cincinnati, Ohio
(85511201)
Saturday March 17, 1990

Saturday March 17, 1990, 7:00 a.m.9:50 a.m.
Special Session on Geometric Function Theory, III
Room 144, Cardwell Hall

7:00 a.m.
A maximum principle for the Bergman space.
Boris Korenblum*, State University of New York, Albany
(8553004)

7:30 a.m.
Maximal functions, A_infinitymeasures and quasiconformal maps.
Susan G. Staples*, University of Texas, Austin
(85530104)

8:00 a.m.
The quasihyperbolic metric is exponentially integrable on H\"older domains in R^n.
Wayne Smith, University of Washington
David A. Stegenga*, University of Hawaii, Honolulu
(85530110)

8:30 a.m.
The boundary distributions of analytic functions on the disc.
Carl Sundberg*, University of Tennessee, Knoxville
(85530135)

9:00 a.m.
The BMOAdistance of a function from VMOA.
David Stegenga, University of Hawaii, Manoa
Kenneth Stephenson*, University of Tennessee, Knoxville
(85530134)

9:30 a.m.
The Cauchy integral operator and the eigenvalue problem for the Laplacian.
Dmitry Khavinson*, University of Arkansas, Fayetteville
J. M. Anderson, University College, England
Victor Lomonosov, Moscow, USSR
(8553010)

Saturday March 17, 1990, 7:00 a.m.9:20 a.m.
Special Session on Partial Differential Equations, III
Room 129, Cardwell Hall

7:00 a.m.
Fully nonlinear parabolic boundary value problems in higher space dimensions, II.
ChinYuan Lin*, Texas A & M University, College Station
(8553553)

7:30 a.m.
Bifurcation turning points in combustion equations.
Karl Gustafson*, University of Colorado, Boulder
(8553506)

8:00 a.m.
Optimal control for elliptic VolterraLotka type equations.
Anthony Leung*, University of Cincinnati
Srdjan Stojanovic, University of Cincinnati
(85535154)

8:30 a.m.
Reactiondiffusion models and elliptic eigenvalue problems.
Chris Cosner*, University of Miami
(85535155)

9:00 a.m.
The wave equation with nonlinear boundary conditions.
Irena Lasiecka, University of Virginia
Andreas Stahel*, University of Utah
(85535153)

Saturday March 17, 1990, 7:00 a.m.9:50 a.m.
Special Session on Graph Theory, III
Room 146, Cardwell Hall

7:00 a.m.
Edgegraceful cubic graphs.
John Watkins*, Colorado College
(8550591)

7:30 a.m.
Ramsey problems and their relation to Turan type extremal problems.
R. J. Faudree*, Memphis State University
M. Simonovits, Hungarian Academy of Sciences, Hungary
(85505111)

8:00 a.m.
On peripheral vertices in graphs.
Gary Chartrand*, Western Michigan University
Garry Johns, Saginaw Valley State University
Ortrud R. Oellermann, University of Natal, South Africa
(8550592)

8:30 a.m.
Some unconventional games on graphs.
Paul Erd\"os*, Hungarian Academy of Sciences, Hungary
(8550565)

9:00 a.m.
Minimum Boolean factorization of tournament codes.
Greg Bain, University of Colorado, Denver
J. Richard Lundgren*, University of Colorado, Denver
John S. Maybee, University of Colorado, Boulder
(8550571)

9:30 a.m.
The dimension of a random partial order of height one.
W. T. Trotter*, Arizona State University
H. Kierstead, Arizona State University
P. Erd\"os, Hungarian Academy of Sciences, Hungary
(85505101)

Saturday March 17, 1990, 7:00 a.m.9:50 a.m.
Special Session on Groups and Geometries, III
Room 145, Cardwell Hall

7:00 a.m.
Affine cap lambdabuildings.
Curtis Bennett*, University of Chicago
(8555166)

7:30 a.m.
Extended generalized polygons.
Richard Weiss*, Tufts University
(8552013)

8:00 a.m.
The embeddings of flagtransitive classical locally polar geometries of rank 3.
Satoshi Yoshiara*, Tufts University
(8555134)

8:30 a.m.
Embeddings of polar spaces.
Peter M. Johnson*, Wayne State University
(85551172)

9:00 a.m.
Locally polar spaces with affine planes.
Hans Cuypers*, Michigan State University
Antonio Pasini, University of Naples, Italy
(85551106)

9:30 a.m.
Totally irregular collineation groups.
Chat Yin Ho*, University of Florida
(8552023)

Saturday March 17, 1990, 7:30 a.m.9:50 a.m.
Special Session on Commutative Algebra, III
Room 102, Cardwell Hall

7:30 a.m.
Strongly regular ring.
Budh Nashier*, Florida State University
(85513122)

8:00 a.m.
Conormal bundle of determinantal curves.
A. Prabhakar Rao*, University of Missouri, St.\ Louis
(85514178)

8:30 a.m.
Rings with low dimensional formal fibres.
Christel Rotthaus*, Michigan State University
(8551316)

9:00 a.m.
Space curves as complete intersection.
Avinash Sathaye*, University of Kentucky
Jon Stenerson, University of Kentucky
(85514195)

9:30 a.m.
Zero cycles and the number of generators of modules.
M. P. Murthy*, University of Chicago
(85513123)

Saturday March 17, 1990, 7:30 a.m.9:50 a.m.
Special Session on Inverse Problems and Scattering Theory, III
Room 143, Cardwell Hall

7:30 a.m.
Inversion of the backscatter data in the 3D potential scattering problem.
Reese T. Prosser*, Dartmouth College
(85581156)

8:20 a.m.
Inverse spectral theory in one and two dimensions.
Roger Knobel, Rensselaer Polytechnic Institute
Joyce R. McLaughlin*, Rensselaer Polytechnic Institute
(85534174)

9:10 a.m.
On an inverse boundary value problem in two dimensions.
Ziqi Sun*, University of Washington
(8553501)

Saturday March 17, 1990, 8:00 a.m.9:50 a.m.
Special Session on Harmonic Analysis and Probability Theory, III
Room 131, Cardwell Hall

8:00 a.m.
Another lacunarity property for Fourier series.
Kenneth A. Ross*, University of Oregon
(8554355)

8:30 a.m.
A homomorphism theorem for maximal multiplier transforms.
Nakhle' Asmar*, University of Missouri, Columbia
Earl Berkson, University of Illinois, UrbanaChampaign
T. Alastair Gillespie, University of Edinburgh, Scotland
(8554317)

9:00 a.m.
Theta function of a Riemannian manifold with boundary.
Pei Hsu*, Northwestern University
(8555864)

9:30 a.m.
The angular part of Brownian motion on negatively curved Riemannian manifolds.
Anton Thalmaier*, University of Texas, Austin
(8556099)

Saturday March 17, 1990, 8:00 a.m.9:50 a.m.
Special Session on Orthostructures, III
Room 121, Cardwell Hall

8:00 a.m.
Constructible hypergraphs.
Christian Schindler*, University of Denver
(85505186)

8:30 a.m.
Generalized measure theory on orthostructures.
Gottfried T. R\"uttimann*, University of Bern, Switzerland
(85528167)

9:00 a.m.
An undecidability result in lattice theory.
Otmar Spinas*, Mathematisches Institut Universit\"at Z\"urich, Switzerland
(85506169)

9:30 a.m.
Maximum likelihood estimation on quasimanuals.
Matthias P. Kl\"ay*, Sandoz AG, Switzerland
David J. Foulis, University of Massachusetts, Amherst
(85560165)

Saturday March 17, 1990, 8:00 a.m.9:50 a.m.
Special Session on Numerical Analysis, II
Room 122, Cardwell Hall

8:00 a.m.
Series expansions for solitary waves.
Steve Pennell*, University of Lowell
(8556579)

8:30 a.m.
Simulations of incompressible flows containing interfaces using front tracking methods.
Gretar Tryggvason*, University of Michigan, Ann Arbor
Ozen Unverdi, University of Michigan, Ann Arbor
Kahled Sbeih, University of Michigan, Ann Arbor
(8556582)

9:00 a.m.
A secondorder accurate scheme for the incompressible NavierStokes equations.
John Strikwerda*, University of Wisconsin, Madison
(8556580)

9:30 a.m.
A new class of nonoscillatory discontinuous Galerkin finite element methods for conservation laws in multidimensions.
Bernardo Cockburn, University of Minnesota, Minneapolis
Suchung Hou, University of Minnesota, Minneapolis
ChiWang Shu*, Brown University
(8556581)

Saturday March 17, 1990, 8:00 a.m.9:50 a.m.
Special Session on Ergodic Theory, III
Room 130, Cardwell Hall

8:00 a.m.
On the converse of the dominated ergodic theorem.
Laszlo I. Szabo*, Ohio State University, Columbus
(8552897)

8:30 a.m.
Measures with prescribed marginals, extreme points and measure preserving transformations.
M. B. Rao*, North Dakota State University
K. Subramanyam, University of North Carolina, Wilmington
(85528151)

9:00 a.m.
Almost everywhere divergence and the "strong sweeping out property".
Alexandra Bellow*, Northwestern University
(85528105)

9:30 a.m.
Weak sequential compactness and a. e. convergence of Cesaro averages.
Dogan Comez*, North Dakota State University
(85547150)

Saturday March 17, 1990, 8:00 a.m.9:50 a.m.
Special Session on Applications of Category Theory, III
Room 103, Cardwell Hall

8:00 a.m.
Topological EilenbergMoore algebras.
Sergio Salbany*, University of Zimbabwe, Zimbabwe
D. Pumpl\"un, Fern Universit\"at Hagen, Federal Republic of Germany
(8551828)

8:30 a.m.
Regular closure operators and compactness.
Gabriele Castellini*, University of Puerto Rico, Mayag\"uez
(8551819)

9:00 a.m.
Appropriate domains for infinite dimensional calculus.
L. D. Nel*, Carleton University
(8555830)

9:30 a.m.
Special objects in the category of cap gammaconvex spaces.
Helmut Rohrl*, La Jolla, California
(8551820)

Saturday March 17, 1990, 10:00 a.m.11:00 a.m.
Invited Address
Examples of CauchyRiemann structures.
Room 101, Cardwell Hall
JeanPierre Rosay*, University of Wisconsin, Madison
(85532202)

Saturday March 17, 1990, 12:30 p.m.1:30 p.m.
Invited Address
Harmonic measure and applications.
Room 101, Cardwell Hall
JangMei Wu*, University of Illinois, UrbanaChampaign
(8553090)

Saturday March 17, 1990, 2:00 p.m.4:20 p.m.
Special Session on Harmonic Analysis and Probability Theory, IV
Room 131, Cardwell Hall

2:00 p.m.
Nonexplosion of a stochastic partial differential equation.
Carl Mueller*, University of Rochester
(85560189)

2:30 p.m.
Gradient estimates using coupling.
Michael Cranston*, University of Rochester
(85560108)

3:00 p.m.
Exponentially fast uniform convergence in one dimensinal stochastic Ising models.
Richard Holley*, University of Colorado, Boulder
Dan Stroock, Massachusetts Institute of Technology
(8556044)

3:30 p.m.
Lifetime distribution of h processes.
Burgess Davis*, Purdue University, West Lafayette
(8556067)

4:00 p.m.
Sharp squarefunction inequalities for conditionally symmetric martingales.
Gang Wang*, Purdue University, West Lafayette
(8556009)

Saturday March 17, 1990, 2:00 p.m.3:50 p.m.
Special Session on Orthostructures, IV
Room 121, Cardwell Hall

2:00 p.m.
Profinite orthomodular lattices.
Tae Ho Choe*, McMaster University
Richard J. Greechie, Kansas State University
(8550650)

2:30 p.m.
Blocks and commutators in orthomodular lattices.
G\"unter Bruns, McMaster University
Richard Greechie*, Kansas State University
(85506164)

3:00 p.m.
Orthomodular structures from sesquilinear forms.
Robert Piziak*, Baylor University
(85506166)

3:30 p.m.
A method of constructing orthomodular lattices.
John R. Harding*, McMaster University
(85506168)

Saturday March 17, 1990, 2:00 p.m.3:50 p.m.
Special Session on Numerical Analysis, III
Room 122, Cardwell Hall

2:00 p.m.
A leastsquares finite element method for Helmholtz equation.
Ching Lung Chang*, Cleveland State University
(8553583)

2:30 p.m.
Numerical simulation of gassolid fluid flows.
YueKuen Kwok*, San Jose State University
(8556546)

3:00 p.m.
Lattice gas automata  a new method for solving the NavierStokes equations.
Shiyi Chen*, Los Alamos National Laboratory
Gary D. Doolen, Los Alamos National Laboratory
(85565129)

3:30 p.m.
A comparison of some numerical conformal mapping methods for exterior regions.
Thomas K. DeLillo*, Wichita State University
Alan R. Elcrat, Wichita State University
(85565130)

Saturday March 17, 1990, 2:00 p.m.5:20 p.m.
Special Session on Geometric Function Theory, IV
Room 144, Cardwell Hall

2:00 p.m.
Goluzin inequalities and minimum energy for mappings onto nonoverlapping regions.
P. L. Duren*, University of Michigan, Ann Arbor
M. M. Schiffer, Stanford University
(8553058)

2:30 p.m.
On a fixed area problem.
Y. J. Leung*, University of Delaware
(85530175)

3:00 p.m.
Linear invariance and uniform local univalence.
Wancang Ma, University of Cincinnati
David Minda*, University of Cincinnati
(85530198)

3:30 p.m.
Extremal distance and quasiconformal circle domains.
David A. Herron*, University of Cincinnati
Pekka Koskela, University of Jyv\"askyl\"a, Finland
(85530117)

4:00 p.m.
Some numerical calculations related to the Riemann Hypothesis.
Karl Barth*, Syracuse University
(85530120)

4:30 p.m.
Iteration and zeros of the second derivative.
A. Hinkkanen*, University of Texas, Austin
(85530103)

5:00 p.m.
Real zeros of the second derivative of the reciprocal of an entire function.
George Csordas, University of Hawaii, Honolulu
Wayne Smith*, University of Hawaii, Honolulu
Jack Williamson, University of Hawaii, Honolulu
(85530133)

Saturday March 17, 1990, 2:00 p.m.3:50 p.m.
Special Session on Partial Differential Equations, IV
Room 129, Cardwell Hall

2:00 p.m.
Existence of travelling wave solutions for an evolutionary ecology model.
Roger Lui*, University of Utah
(8553533)

2:30 p.m.
Slow motion manifolds for the CahnHilliard equation in 1 space dimension.
Nicholas D. Alikakos*, University of Tennessee, Knoxville
(85535203)

3:00 p.m.
Informal Discussion

Saturday March 17, 1990, 2:00 p.m.4:50 p.m.
Special Session on Commutative Algebra, IV
Room 102, Cardwell Hall

2:00 p.m.
Linear triangularization of homogeneous polynomial maps.
David Wright*, Washington University
(8551398)

2:30 p.m.
Ranks of indecomposable modules over onedimensional rings, II.
Leo Chouinard, University of Nebraska, Lincoln
Sylvia Wiegand*, University of Nebraska, Lincoln
(85513158)

3:00 p.m.
On the structure of certain normal ideals.
Craig Huneke, Purdue University, West Lafayette
Wolmer Vasconcelos, Rutgers University, New Brunswick
Bernd Ulrich*, Michigan State University
(85513119)

3:30 p.m.
Rees algebras of twodimensional CohenMacaulay local rings.
Jugal Verma*, Louisiana State University, Baton Rouge
(85513145)

4:00 p.m.
Divisorial properties of the canonical module for invariant subrings.
Dana T. Weston*, University of Missouri, Columbia
(8551332)

4:30 p.m.
On the nonexistence of a minimal algebra resolution despite vanishing of Avramov obstructions.
Hema Srinivasan*, University of Missouri, Columbia
(85513121)

Saturday March 17, 1990, 2:00 p.m.4:20 p.m.
Special Session on Inverse Problems and Scattering Theory, IV
Room 143, Cardwell Hall

2:00 p.m.
Informal Discussion

Saturday March 17, 1990, 2:00 p.m.3:50 p.m.
Special Session on Ergodic Theory, IV
Room 130, Cardwell Hall

2:00 p.m.
Multiparameter and subsequence ergodic theorems.
James H. Olsen*, North Dakota State University
(85547131)

2:30 p.m.
Mixing examples in the class of piecewise continuous and expanding interval maps.
Christopher Bose*, University of Victoria
(85528124)

3:00 p.m.
Polynomial van der Waerden implies polynomial Szemeredi.
Vitaly Bergelson*, Ohio State University, Columbus
(85528180)

3:30 p.m.
Counterexamples from Gaussian automorphisms.
Andr\'es del Junco*, University of Toronto
(85528190)

Saturday March 17, 1990, 2:00 p.m.4:50 p.m.
Special Session on Groups and Geometries, IV
Room 145, Cardwell Hall

2:00 p.m.
Generalized quadrangles with s=t^2: A survey of recent results.
Stanley E. Payne*, University of Colorado, Denver
(85551126)

2:30 p.m.
Skeletons of conical flocks.
Norman L. Johnson*, University of Iowa
(8555126)

3:00 p.m.
Generalized quadrangles in pgroups.
Diane Herrmann*, University of Chicago
(85520132)

3:30 p.m.
Restrictions on groups with a Kantor family.
Xu Ming Chen, Wayne State University
Daniel Frohardt*, Wayne State University
(85520171)

4:00 p.m.
Orthogonal resolutions of designs.
Spyros S. Magliveras*, University of Nebraska, Lincoln
(8550561)

4:30 p.m.
Informal Discussion

Saturday March 17, 1990, 2:00 p.m.4:20 p.m.
Special Session on Applications of Category Theory, IV
Room 103, Cardwell Hall

2:00 p.m.
An internal characterization of Beta.
Guenther E. Richter*, University of Bielefeld, Federal Republic of Germany
(8551825)

2:30 p.m.
Enriched category theory based on relations.
Jurgen Koslowski*, Macalester College
(8551847)

3:00 p.m.
Aepimorphisms, diagonalseparation, and disconnectedness.
Harriet M. Lord*, California State Polytechnic University
(8551814)

3:30 p.m.
Topological universe hulls inside the category of pseudotopological spaces.
Friedhelm Schwarz*, University of Toledo
(8551885)

4:00 p.m.
Completely regular spaces.
H. L. Bentley*, University of Toledo
E. LowenColebunders, Free University of Brussels, Belgium
(8555459)
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