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Guy Jacobsohn Memorial Mathematics Colloquium Series

In 1986, the mathematics faculty of Converse College, Wofford College and University of South Carolina Upstate (then USC Spartanburg) joined under the leadership of USC Upstate professor Guy Jacobsohn to sponsor an annual mathematics colloquium series. The colloquia are designed to encourage interaction among mathematics students and faculty.

Each participating institution hosts one mathematics lecture on their campus each semester. Guest lecturers have included nationally recognized mathematicians as well as faculty from the participating colleges, the University of South Carolina and Clemson University. The programs are designed at a level that can be understood by the undergraduate mathematics student. The purpose of the series is to enrich the undergraduate experience and to provide an opportunity for the students and faculty on the three campuses to get to know one another.

Upon the untimely passing of Guy Jacobsohn in the spring of 2003, the series was renamed from the Spartanburg Collegiate Mathematics Colloquium Series to the Guy Jacobsohn Memorial Mathematics Colloquium Series.

The brochure for the Fall 2013 Colloquium Series can be found here.

Upcoming colloquia:

Wednesday, October 23, 2013: Dr. Tim Chartier (Davidson College): "Putting a Spring in Yoda's Step"
Time and Place: Olin Building Room 101, Wofford College, 4:00 pm

Abstract: When the character Yoda first appeared on the silver screen, his movements were due to the efforts of famed muppeteer Frank Oz. In Star Wars Episode II: Attack of the Clones, Yoda returned to the movies but this time the character was not a puppet but a digital image within a computer. This talk will discuss the role, or more aptly the force, of mathematics behind a few aspects of movie special effects. Armed with differential equations, animators can create a believable flow to Yoda’s robe or a convincing digital stunt person.

Thursday, November 21, 2013: Kirsti Wash (Clemson University):  "2-Tone Colorings in Graphs"
Time and Place: Kuhn 217, Converse College, 3:30 pm

Abstract: Graph coloring is perhaps one of the most popular concepts in graph theory, with applications in social networks, computer science and even games. One particular variation of graph coloring, referred to as a 2-tone k-coloring, assigns a set of 2 colors to each vertex of a graph from the set {1,...,k} with the restriction that any two vertices distance d apart share fewer than d colors in common. This past summer, a team of undergraduates considered 2-tone k-colorings in various graph products in the Clemson REU in computational algebraic geometry, combinatorics, and number theory. In this talk, we focus on some general results in 2-tone colorings of graphs and discuss a few key results from the REU project.

Recent colloquia:

Thursday, September 19, 2013: Dr. Akim Adekpedjou (Missouri University of Science and Technology): "Semi-parametric Inference for a Flexible Cox-Type Regression Model with Recurrent Event Data"
Time and Place: The George Room 250, George Dean Johnson, Jr. College of Business and Economics, 3:30pm

Abstract: Recurrent event data is often observed in a wide variety of disciplines including the biomedical, public health, engineering, economic, actuarial science and social science settings. The outcome of interest is recurrent and consequently could occur several times during the study window, which could be fixed or random. Examples are chronic disease recurrences, cancer tumor recurrence, repeated hospitalization, successive non-life insurance claims, repeated failures of an AC machine. In this talk, we consider the problem of estimating the baseline hazard function in a Cox-type regression model for recurrent events. We propose a Nelson-Aalen type estimator of the baseline intensity function that takes into account the change in age of a unit due to interventions, allows for the possibility of the unit receiving a life supplement and provides a mechanism for researchers to incorporate timedependent covariates. The procedures are applied to a bladder cancer data and those provide some interesting insights into how different choices of the effective age process affect overall conclusions.

Division Chair
Dr. Jerome Lewis

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