Weekly Calendar

September 17-21, 2001

Monday Tuesday Wednesday Thursday Friday

Seminars Announcements Conferences Calendar Archive

Items for inclusion in the Weekly Calendar should be submitted via e-mail to Hilda Britt. Deadline for inclusion in the Weekly Calendar is 5 p.m. Thursdays. Speakers are encouraged to provide abstracts.

Orange & Blue Bar



MONDAY, SEPTEMBER 17

  
RAP ``Etale cohomology'',  159 Altgeld Hall,  10:00 a.m.
  
Marco Schlichting
The category of sheaves (cont.)

  
Math 400 - Introduction to Graduate Mathematics,  245 Altgeld Hall,  4:00 p.m.
  
Professor Joseph Rosenblatt (Chair, Department of Mathematics)
Programs in the Department of Mathematics and Why Everyone Should be an Analyst


TUESDAY, SEPTEMBER 18

  
Symplectic and Contact Geometry RAP,  143 Henry,  10:00 a.m.
  
Chris Willett
The Marsden-Weinstein-Meyer Theorem in Contact Geometry
  
Abstract: We show that the classicial Marsden-Weinstein-Meyer symplectic reduction procedure extends to the category of contact manifolds with symmetry. The work of Guillemin-Sternberg and Albert will be discussed as well.

  
Max Newman Topology,  345 Altgeld,  11:00 a.m.
  
Chris French (UIUC)
Title is: TBA.

  
RAP ``Spaces of non-positive curvature'',  243 Altgeld Hall,  11:00 a.m.
  
Craig Davis (UIUC)
CAT(0) cubical complexes
  
Abstract: We will describe so called ``cubical complexes" which are spaces obtained by gluing a collection of euclidean cubes along isometries between their faces. An explicit combinatorial condition will be given which ensures that such a complex is a CAT(0)-space.

  
Probability and Statistics Seminar,  2 Illini Hall,  11:00 p.m.
  
Professor Roger Koenker (Joint work with Prof. Ivan Mizera, Univ. of Edmonton), University of Illinois)
Penalized Triograms: Total Variation Regularization for Bivariate Smoothing
  
Abstract: Hansen, Kooperberg and Sardy1998 introduced a family of continuous, piecewise linear functions defined over adaptively selected triangulations of the plane as a general approach to statistical modeling of bivariate densities, regression and hazard functions. These triograms enjoy a natural affine equivariance that offers distinct advantages over competing tensor product methods that are more commonly used in statistical applications. In this paper we explore a smoothing spline variant of the triogram model based on a simple roughness penalty adapted to the piecewise linear structure of the triogram model. The proposed roughness penalty may be interpreted as a total variation penalty on the gradient of the fitted function. The methods are illustrated with two artificial examples and with an application to estimated quantile surfaces of land value in the Chicago metropolitan area.

  
Several Complex Variables Seminar,  243 Altgeld Hall,  12:00 p.m.
  
Professor Robert Kaufman
Function Algebras and Several Complex Variables, III

  
Quantum Information Science Seminar,  280 Materials Research Laboratory,  12:00 p.m.
  
Professor Paul Kwiat (Physics Department)
Recent experiments using entangled photons for quantum cryptography

  
Analytic and Elementary Number Theory,  243 Altgeld Hall,  1:00 p.m.
  
Favorite conjectures
  
Abstract: This is a follow-up to last Tuesday's talk by Professor Bateman, in which he presented conjectures in number theory that were among his personal favorites. This time, members of the audience are encouraged to present some of their own favorite conjectures in short talks of 5 - 10 minutes.

  
Differential Geometry Seminar,  347 Altgeld Hall,  1:00 p.m.
No meeting today

  
Logic Seminar,  241 Altgeld Hall,  1:00 p.m.
  
Wai Yan Pong
Ordinal Dimensions in Differentially Closed Field with finitely many commuting derivations
  
Abstract: We start by reviewing three ordinal dimensions, namely differential height (RH), differential order (RD) and D-dimension in ordinary differential fields. Then we discuss how these can be generalized to the partial differential fields and their relations. Finally we give a characterization of forking in the theory of differentially closed fields with finitely many commuting derivations using these dimensions.

  
Geometric Potpourri Seminar,  243 Altgeld Hall,  2:00 p.m.
  
Professor George Francis (UIUC Department of Mathematics)
Navigating Virtual Environments
  
Abstract: How to navigate a virtual environment and other problems addressed by the illiMath2001 REU-students last summer required some practical, if elementary geometrical insights. We report on those involved in the Bishop Coaster, the Special Relativity, and the Quaternion Navigator Projects. Tantalizing previews of these and the other five projects will be part of the live demo.

  
Stochastic and Nonlinear Analysis,  347 Altgeld Hall,  2:00 p.m.
  
Marta Lewicka (Max-Planck-Institut for Mathenmatics in the Sciences, Leipzig)
Stability conditions for wave patterns with large waves.
  
Abstract: We present a variety of conditions implying the well posedness or L1 stability of systems of conservation laws (in 1D) near solutions containing shock or rarefaction waves of arbitrarily large strength. We explain and compare these conditions, also checking their validity for some chosen systems.

  
RAP on Geometric Representation Theory,  345 Altgeld Hall,  2:30 p.m.
  
Professor William Haboush
Chapter 2 of Chriss and Ginzburg
  
Abstract: I will continue the discussion of the deformation construction and hope to discuss Bialynicki Birula decompositions and to initiate a discussion of Borel Moore cohomology.

  
Commutative Ring Theory Seminar,  243 Altgeld Hall,  3:00 p.m.
  
Sean Sather-Wagstaff
Local Chern Characters.
http://www.math.uiuc.edu/ ssather/MATH/crt_fa01.html

  
Graph Theory and Combinatorics,  241 Altgeld Hall,  3:00 p.m.
  
Michael Pelsmajer
Equitable list coloring for graphs with maximum degree 3
  
Abstract: A graph is equitably list k-colorable if for every assigment of lists of size k to its vertices, there is a proper list coloring such that each color class has size at most én/kù. We show that every graph with maximum degree 3 is equitably list 4-colorable.

  
Study Seminar on Harmonic Analysis,  347 Altgeld Hall,  3:00 p.m.
  
Dr. Jorge Rivera-Noriega
Harmonic analysis in locally flat domains, cont.
  
Abstract: We are studying the paper of C. Kenig and T. Toro on harmonic analysis in locally flat domains


WEDNESDAY, SEPTEMBER 19

  
RAP ``Etale cohomology",  159 Altgeld Hall,  10:00 a.m.
  
Josh Mullet
Direct and inverse images of sheaves

  
RAP - Conformal invariance, intersection exponents and critical percolation,  145 Altgeld Hall,  4:00 p.m.
  
Robert Bauer
Time change and conformal invariance of Brownian motion, I

  
Information Protection Seminar,  114 CSRL,  4:30 p.m.
  
Annegret Weng (IEM, University of Essen)
On group order distributions for abelian varieties of low dimension
  
Abstract: We discuss some theoretical and experimental results about the frequency of prime and almost prime orders of elliptic curves and Jacobians of hyperelliptic curves. In our setting we fix a curve defined over a number field and consider the different group orders when specializing it at prime ideals.

  
Nonstandard Analysis Seminar,  243 Altgeld Hall,  4:00 p.m.
Organizational meeting; all interested people are welcome


THURSDAY, SEPTEMBER 20

  
Math - Physics (BCDE) Lunch Seminar,  6-110 Engineering Science Bldg,  12:05 p.m.
  
Professor Sheldon Katz (UIUC)
Geometry of Large N Dualities, III

  
Several Complex Variables Seminar,  243 Altgeld Hall,  12:00 p.m.
  
Bernhard Lamel (Doob Research Asst. Prof)
Mapping Problems in Several Complex Variables, III

  
Analytic and Elementary Number Theory,  243 Altgeld Hall,  1:00 p.m.
  
Professor Bruce Berndt (UIUC)
A broad survey of the work of Srivinasa Ramanujan, II

  
Group Theory,  347 Altgeld Hall,  1:00 p.m.
  
Professor Derek Robinson (UIUC)
Algorithms for Polycyclic-by-Finite Groups, III
  
Abstract: In this series of talks a survey of known algorithms for PF-groups will be given. Then new algorithms to test surjectivity of derivations will be presented, with application to the problem of deciding of two given subgroups of a PF-group permute.

  
RAP on Noncommutative Lp spaces,  345 Altgeld Hall,  1:00 p.m. (cont. at 3:00 p.m.)
  
Pedro Pointevin (Grad Student, UIUC)
Introduction to noncommutative martingales, II
  
Abstract: Introduction to noncommutative conditional expectations and maringales

  
Algebraic Number Theory,  241 Altgeld Hall,  2:00 p.m.
  
Michael Bush
A method for computing Gal (knr,p/k)
  
Abstract: Let k be a number field. We will explain how the p-group generation algorithm from computational group theory can be applied to compute large quotients of the pro-p group G = \textGal (knr,p/k) where knr,p is the maximal unramified p-extension of k. We will look at several interesting examples including the field k = \bold Q(Ö[(-2379)]) where we show the 2-class tower is finite, partially answering a question posed by Stark. This talk should be accessible to anyone with a knowledge of basic algebraic number theory.

  
Analysis Seminar,  243 Altgeld Hall,  2:00 p.m.
  
Marius Junge
The local structure of noncommutative Lp-spaces
  
Abstract: In analogy with the concept of script Lp spaces in Banach space theory, we investigate several version of operator script Lp spaces and apply these ideas to find a (Schauder) basis for separable, nuclear C*-algebras, separable preduals of injective von Neumann algebras and Lp spaces associated with the left regular representation of the free group. This is joint work with N.J. Nielsem Z.J. Ruan and Q. Xu.

  
Knot Theory RAP,  345 Altgeld Hall,  2:00 p.m.
  
Nadya Shirokova
Finite type knot invariants.
  
Abstract: We will discuss the axiomatics for the invariants of finite type, introduced by V.Vassiliev. We will study their properties and show that classical invariants, like Alexander-Conway polynomial can be decomposed over invariants of finite type.

  
RAP on Research Problems in Coloring Theory and Extremal Combinatorics,  241 Altgeld Hall,  3:00 p.m.
This week we will discuss research problems in list coloring and graph representation.

  
Commutative Ring Theory Seminar,  243 Altgeld Hall,  3:00 p.m.
  
Professor Sankar Dutta
On Modules of Finite Projective Dimension over Complete Intersections.
http://www.math.uiuc.edu/ ssather/MATH/crt_fa01.html

  
Fall Department Meeting,  314 Altgeld Hall,  4:00 p.m.
Fall Department Meeting
(Refreshments will be served following the meeting)


FRIDAY, SEPTEMBER 21

  
RAP ``Etale cohomology",  159 Altgeld Hall,  10:00 a.m.
  
Josh Mullet
Direct and inverse images of sheaves (cont.)

  
RAP - Conformal invariance, intersection exponents and critical percolation,  145 Altgeld Hall,  4:00 p.m.
  
Robert Bauer
Time change and conformal invariance of Brownian motion, II

  
Model Theory Seminar,  141 Altgeld Hall,  4:00 p.m.
  
Mr. Thomas Rohwer
Module definable sets in a field of Laurent series, II
  
Abstract: Let k be a finite field of characteristic p, K = k((x)) the field of Laurent series over k, and R = K[F] the ring of twisted polynomials over K with respect to the commuting relation Fl = lp F for all l in K. K is a left R module using the natural action of K on K and letting F act as l® lp. Some results on the structure of solution sets of linear equations (and projections of these) in the module K will be presented.

File translated from TEX by TTH, version 2.01.
On 14 Sep 2001, 09:10.