Seminar September 2011- May 2012 | Mathematics | SIU

Home
Southern Illinois University

CONTACT

SIU.EDU

College of Science

Seminar September 2011- May 2012

Seminar: Reading Seminar
Title:Finished for the semester
Speaker: None

Seminar: Potpourri
Title: Continued Fractions Continued
Speaker: Bryan Arnold, SIUC
Date: Thursday, May 3, 2012
Place: Neckers 356
Time: 1:00pm-2:00pm

Seminar: SAM (Seminar on Applied Math)
Title: Stochastics Alpha-Calculus Part 2
Speaker: Abdallah M.A. Talafha, SIUC
Date: Thursday, May 3, 2012
Place: Neckers A 410
Time: 12:00pm-1:00pm

Seminar: Reading Seminar
Title: Semester Wrap-Up
Speaker: Joseph Hundley, SIUC
Date: Thursday, April 26, 2012
Place: Neckers 356
Time: 12:00pm-1:00pm

Seminar: Potpourri
Title: TBA
Speaker: TBA
Date: Thursday, April 26, 2012
Place: Neckers 356
Time: 1:00pm-2:00pm

Seminar: SAM (Seminar on Applied Math)
Title: Stochastics Alpha-Calculus
Speaker: Abdallah M.A. Talafha
Date: Thursday, April 26, 2012
Place: Neckers A 410
Time: 12:00pm-1:00pm

Seminar: Reading Seminar
Title: Poisson Summation Formula
Speaker: Wesley Calvert, SIUC
Date: Thursday, April 19, 2012
Place: Neckers 356
Time: 12:00pm-1:00pm

Seminar: Potpourri
Title: Continued Fractions Continued
Speaker: B. Arnold, SIUC
Date: Thursday, April 19, 2012
Place: Neckers 356
Time: 1:00pm-2:00pm

Seminar: SAM (Seminar on Applied Math)
Title:Global Stability of the Disease Free Equilibrium of Stochastic SIR Model-Part 3
Speaker: Kursad Tosun
Date: Thursday, April 19, 2012
Place: Neckers A 410
Time: 12:00pm-1:00pm

Seminar: Reading Seminar
Title: Adelic Fourier Inversion
Speaker: B. Arnold, SIUC
Date: Thursday, April 12, 2012
Place: Neckers A 218
Time: 12:00pm-1:00pm

Seminar: Potpourri
Title: Cancelled
Speaker: Cancelled
Date: Thursday, April 12, 2012
Place: Neckers 356
Time: 1:00pm-2:00pm

Seminar: Seminar
Title: Global Stability of the Disease Free Equilibrium of Stochastic SIR Model
Speaker: K. Tosun, SIUC
Date: Thursday, April 12, 2012
Place: Neckers A 410
Time: 12:00pm-1:00pm

Seminar: Reading Seminar
Title: TBA
Speaker: B. Arnold, SIUC
Date: Thursday, April 4, 2012
Place: Neckers 356
Time: 12:00pm-1:00pm

Seminar: Potpourri
Title: Continued Fractions II
Speaker: B. Arnold, SIUC
Date: Thursday, April 4, 2012
Place: Neckers 356
Time: 1:00pm-2:00pm

Seminar: Seminar
Title: "Mathematical Models in Epidemiology"
Speaker: K. Tosun, SIUC
Date: Thursday, April 4, 2012
Place: Neckers A 410
Time: 12:00pm-1:00pm

Seminar: Reading Seminar
Title: "The Lattice Model of the Weil Representation."
Speaker: Shuichiro Takeda, University of Missouri
Date: Thursday, March 29, 2012
Place: Neckers 356
Time: 12:00pm-1:00pm

Seminar: Potpourri
Title: Continued Fractions - Part 1
Speaker: B. Arnold, SIUC
Date: Thursday, March 29, 2012
Place: Neckers 356
Time: 1:00pm-2:00pm

Seminar: Seminar
Title: Stochastic Wave Equations-Numerical Methods Part 7
Speaker: Haziem Hazaimeh, SIUC
Date: Thursday, March 29, 2012
Place: Neckers A410
Time: 12:00pm-1:00pm

 

Seminar: Reading Seminar
Title: Duality for classical groups
Speaker: Chris Jantzen, East Carolina University
Date: Thursday, March 22, 2012
Place: Neckers 356
Time: 12:00pm-1:00pm

Seminar: Potpourri
Title:Discussion on Apollonian Window
Speaker: Jerzy Kocik
Date: Thursday, March 22, 2012
Place: Neckers 356
Time: 1:00pm-2:00pm

Seminar: Seminar
Date: Thursday, March 22, 2012
Place: Neckers A 410
Time: Cancelled

 

Seminar: Seminar
Title: Stochastic-Wave Equations Numberical Methods-Part 6
Speaker: Haziem Hazaimeh, SIUC
Date: Thursday, March 8, 2012
Place: Neckers A 410
Time: 12:00pm-1:00pm

Seminar: Reading Seminar
Title: Paramodular forms, representations, and varieties
Speaker: Jeff Breeding, St. Louis Univ.
Date: Thursday, March 8, 2012
Place: Neckers 356
Time: 12:00pm-1:00pm

Seminar: Potpourri
Title: Gaussian quadrature, association schemes as instances of Kravchuk-type orthogonality
Speaker:Professor Feinsilver, SIUC
Date: Thursday, March 8, 2012
Place: Neckers 356
Time: 1:00pm-2:00pm

 

Seminar: Seminar
Title: Stochastic-Wave Equations Numberical Methods-Part 5
Speaker: Haziem Hazaimeh, SIUC
Date: Thursday, March 1, 2012
Place: Neckers A 410
Time: 12:00pm-1:00pm

Seminar: Reading Seminar
Title: P-adic Fourier Transform
Speaker: Bryan Arnold, SIUC
Date: Thursday, March 1, 2012
Place: Neckers 356
Time: 12:00pm-1:00pm

Seminar: Potpourri
Title: Professor Feinsilver, SIUC
Speaker: The Columns Theorem for Symmetric Tensors
Date: Thursday, March 1, 2012
Place: Neckers 356
Time: 1:00pm-2:00pm

 

Seminar: Seminar
Title: Nonlinear Stochastic Wave Equations - Part 4 "Stability"
Speaker: Haziem Hazaimeh, SIUC
Date: Thursday, February 23, 2012
Place: Neckers A 410
Time: 12:00pm-1:00pm

Seminar: Reading Seminar
Title: Adelesand Ideles over the rational numbers
Speaker: Wahidah Alsibiana, SIUC
Date: Thursday, February 23, 2012
Place: Neckers 356
Time: 12:00pm-1:00pm

Seminar: Potpourri
Title: Distance Functions on Graphs Part ll
Speaker: Professor Calvert, SIUC
Date: Thursday, February 23, 2012
Place: Neckers 356
Time: 1:00pm-2:00pm

Seminar: Seminar
Title: Nonlinear Stochastic Wave Equations - Part 3
Speaker: Haziem Hazaimeh, SIUC
Date: Thursday, February 16, 2012
Place: Neckers 365
Time: 11:00pm-12:00pm

Seminar: Reading Seminar
Title: Distribution of rational and integral points and representation theory
Speaker: Ramin Takloo-Bighash, SIUC
Date: Thursday, February 16, 2012
Place: Neckers 356
Time: 12:00pm-1:00pm

Seminar: Potpourri
Title: Distance Functions on Graphs
Speaker: Professor Calvert, SIUC
Date: Thursday, February 16, 2012
Place: Neckers 356
Time: 1:00pm-2:00pm

Seminar: Reading Seminar
Title: Adelesand Ideles over the rational numbers
Speaker: Wahidah Alsiniani, SIUC
Date: Thursday, February 9, 2012
Place: Neckers 356
Time: 12:00pm-1:00pm

Seminar: Seminar
Title: Nonlinear Stochastic Wave Equations - Part 2
Speaker: Haziem Hazaimeh, SIUC
Date: Thursday, February 9, 2012
Place: Neckers A 410
Time: 12:00pm-1:00pm

Seminar: Potpourri
Title: Part III: The Eternal Thread: Krawtchouk Polynomials
Speaker: Prof. Feinsilver, SIUC
Date: Thursday, February 9, 2012
Place: Neckers 356
Time: 1:00pm-2:00pm

Seminar: Reading Seminar
Title: Adeles over Q
Speaker: Liz Haynes, SIUC
Date: Thursday, February 2, 2012
Place: Neckers 356
Time: 12:00pm-1:00pm

Seminar: Seminar
Title: Nonlinear Stochastic Wave Equations - Part 1
Speaker: Haziem Hazaimeh, SIUC
Date: Thursday, February 2, 2012
Place: Neckers A 410
Time: 12:00pm-1:00pm

Seminar: Potpourri
Title: Part II: The Eternal Thread: Krawtchouk Polynomials
Speaker: Prof. Feinsilver, SIUC
Date: Thursday, February 2, 2012
Place: Neckers 356
Time: 1:00pm-2:00pm

Seminar: Reading Seminar
Title: Adeles over Q
Speaker: Liz Haynes, SIUC
Date: Thursday, January 26, 2012
Place: Neckers 356
Time: 12:00pm-1:00pm

Seminar: Potpourri
Title:The Eternal Thread: Krawtchouk Polynomials
Speaker: Prof. Feinsilver, SIUC
Date: Thursday, January 26, 2012
Place: Neckers 356
Time: 1:00pm-2:00pm

Seminar: Representation Theory Seminar
Title: Local coefficients of non-generic representations of odd orthogonal groups
Speaker: Daniel File, University of Iowa
Date: Thursday, December 1, 2011
Place: Neckers 356
Time: 10:00am
Abstract: Shahidi's definition of the local coefficient of a representation relies on the existence of a unique model called the Whittaker model. The local coefficient allowed him to define the Langlands L-function of an automorphic representation at the so called "bad" primes, and establish certain predicted analytic properties for these L-functions such as the functional equation and meromorphic continuation.

However, there are examples of automorphic representations that do not posses a Whittaker model, and so Shahidi's method does not apply. Friedberg and Goldberg were able to use another model to define a local coefficient; however, their result required a certain minimality hypothesis. Recently, Goldberg has used this technique to prove a "crude" functional equation for certain automorphic representations of $SO(5)$. I will describe the method of Friedberg and Goldberg and recent improvements to their result.

Colloquium: Math SIUC
Title:Practical Multivariate Robust Statistics
Speaker:Professor David Olive, SIUC
Date: Thursday, December 1, 2011
Place: Neckers 156
Time: 3:00pm
Abstract: Statistics is the science of extracting useful information from data, and a statistical model is used to provide a useful approximation to some of the important characteristics of the population which generated the data.
Multivariate Robust Statistics tries to find methods that give good results for multiple linear regression or multivariate location and dispersion for a large group of underlying distributions and that are useful for detecting certain types of outliers, which are observations that lie far away from the bulk of the data. Plots for detecting outliers and high leverage cases, and  prediction intervals and regions that work for large classes of distributions are also of interest. This talk will survey the practical methods that I have been developing since 2004 and give a preview of the Fall 2012 Math 583 class Robust Multivariate Analysis.
Almost all of the competing literature on  multivariate robust statistics follows the Rousseeuw and Yohai paradigm which is based on one of the largest and longest running scientific hoaxes in history: that impractical multivariate robust estimators  can be efficiently computed  by using some criterion to select a fit from a fixed number of easily computed trial fits. Hence this literature is untrustworthy: the best papers either give large sample theory for brand name estimators that take far too long to compute, or give practical outlier resistant methods that are not backed by large sample theory. Click here for the flier.

Seminar: Algebra & Representation
Title:Fields of Definition and Nonsplit Groups
Speaker: Professor Joseph Hundley, SIUC
Date: Thursday, November 17, 2011
Place: Neckers 356
Time: 10:00am

Seminar: Potpourri Seminar
Title:Bernoulli Systems: Kravchuk Polynomials via  Symmetric Tensor Powers
Speaker:Professor Philip Feinsilver, SIUC
Date: Friday, October 7, 2011
Place: Neckers 356
Time: 1:00pm

Colloquium: Math SIUC
Title:Utility Maximization and (F)BSDE of Quadratic Growth
Speaker:Peter Imkeller, HU Berlin, CV
Date: Thursday, November 17, 2011
Place: Neckers 156
Time: 3:00pm
A financial market model is considered on which agents (e.g. insurers) are subject to an exogenous financial risk, which they trade by issuing a risk bond. They are able to invest in a market asset correlated with the exogenous risk. We investigate their utility maximization problem, and calculate bond prices using utility indifference. In the case of exponential utility, this hedging concept is interpreted by means of martingale optimality, and solved with BSDE with drivers of quadratic growth in the control variable.
For more general utility functions defined on the whole real line we show that if an optimal strategy exists then it is given in terms of the solution (X, Y, Z) of a fully coupled FBSDE. Conversely if the FBSDE admits a solution (X, Y, Z) then an optimal strategy can be obtained. In the complete market case, an assumption on the risk aversion guarantees that the FBSDE admits a solution for any finite time horizon. As a particular example of our approach we recover the BSDE for exponential utility, and are able to treat non-classical utility functions like the sum of exponential ones.
For utility functions defined on the half line we also reduce the maximization problem to the solution of FBSDE connected with the ones obtained by Peng (1993). In complete markets, once again we provide conditions for solvability that are applicable to the power, the logarithmic and some non-classical utilities. In our approach we propose an alternative form of the maximum principle for which the Hamiltonian is reflected in a remarkable martingale. This is joint work with U. Horst, Y. Hu, A. Réveillac, and J. Zhang. Click here for the flier.

Colloquium: Math SIUC
Title:Applying diffusion models to insect dispersal in real landscapes - tales from two systems
Speaker:John Reeve, Southern Illinois University, Carbondale
Date: Thursday, October 20, 2011
Place: Neckers 156
Time: 3:00pm
Dispersal is a fundamental population process in ecology. We use diffusion models to examine dispersal in two systems, bark beetles and their predators in pine ecosystems, and a planthopper and its egg parasitoid in a prairie one. These organisms inhabit complex landscapes that are composed of habitat patches embedded within non-habitat (matrix) regions of several different types. We conducted mark-recapture experiments in which insects were released at different locations within habitat patches, the matrix, and at habitat-matrix edges. We then fitted diffusion models to these observations which incorporated different diffusion rates for habitat vs. matrix as well as edge behavior in the form of a biased random walk. Diffusion rates and edge behavior were species specific and strongly dependent on the matrix type in both these systems. For the planthoppers, differences in edge behavior may explain why the surrounding matrix strongly affects their local population dynamics. For more information about John Reeve go to here. For more information about the colloquium go here.

Colloquium: Math SIUC
Title:Dihedral Fourier Analysis of Symmetry Preference Data
Speaker:Marlos Viana, University of Illinois at Chicago Eye Center, Chicago, USA
Date: Thursday, October 6, 2011
Place: Neckers 156
Time: 3:00pm
In this talk I will briefly review the notion of Fourier analysis over finite groups and emphasize the case of dihedral analysis and its applications in optics and molecular biology. The notion of experimental results indexed by symmetries will be discussed and illustrated with a study in symmetry preferences. The notions of symmetry orbits, symmetry invariants, arbitrariness resolution, as well as the determination of the orbit invariants as Fourier transforms will be discussed and statistically evaluated for particular cases. The experimental design and results to be discussed in the illustration are described in detail and available here. Check out the flier here.

Seminar: Algebra & Representation
Title:GSpin groups
Speaker:Professor Joseph Hundley
Date: Thursday, October 6, 2011
Place: Neckers 356
Time: 1:00pm

Seminar: Potpourri Seminar
Title:Dihedral Fourier Analysis and Applications in Statistical Optics: A Brief Introduction
Speaker:Marlos Viana, University of Illinois at Chicago Eye Center, Chicago, USA
Date: Friday, October 7, 2011
Place: Neckers 356
Time: 1:00pm
In this talk I will describe the notion of experimental data indexed by symmetries, with particular interest in optical data  indexed by (dihedral) symmetries of planar rotations and reversals.  The purpose of the talk is to show that there is a formal algebraic connection between experimental results obtained along a dihedral symmetry orbit and the statistical analysis of those data, both at the exploratory and inferential levels.  I will also emphasize the role of the dihedral Fourier transform in the determination and interpretations of the underlying orbit invariants.  Data analytic aspects of refraction power, corneal curvature, and polarimetric-enhanced imaging will be presented within the framework of dihedral analysis.

Seminar: Algebra & Representation
Title:GSpin groups
Speaker:Professor Joseph Hundley
Date: Thursday, September 29, 2011
Place: Neckers 356
Time: 10:00am

Seminar:Potpourri Seminar
Title:
Speaker:
Date: Thursday, September 29, 2011
Place: Neckers 356
Time: CANCELLED

Colloquium: Math SIUC
Title:The Best Conditioned Markov Chains
Speaker: Dr. Jianhong Xu
Date: Thursday, September 22, 2011
Place: Neckers A 156
Time: 3:00pm
ABSTRACT: What makes a best conditioned Markov chain? In addition to its merit in computation, such
a chain also shows optimality in its maximum mean first passage time between any two states. Here is the story about the settlement of a then three-year-old conjecture due to Steve Kirkland on best conditioned Markov chains. The counterexamples were sort of elusive. I wouldn't have been able to stumble across them without Mathematica. Event Flier

Seminar:Algebra & Representation
Title: Iwahori factorization for covering groups
Speaker: Professor Dubravka Ban
Date: September 15, 2011
Day: Thursday
Time: 10:00am