# TGTS Tetrahedral Geometry/Topology Seminar

Sponsored by Elizabethtown College, Franklin and Marshall College,
Lebanon Valley College, and Millersville University
## CELEBRATING 10 YEARS OF TGTS

On 7 March 2003, Millersville University joined with Elizabethtown and
Franklin & Marshall Colleges to launch what was initially called the
Triangle Geometry/Topology Seminar, or simply "TGTS". On 9 September
2005, Lebanon Valley College joined the group, and the name was changed
to the Tetrahedral Geometry/Topology Seminar, preserving the acronym
TGTS. On the first Friday of each month during the academic year,
mathematicians specializing in geometry and topology gather for TGTS
around a topic of common interest at Hempfield High School in
Landisville, Pennsylvania. This past March marked 10 years of TGTS, and
to celebrate, the following all-star cast of former TGTS speakers was
invited back to speak during the 2013-14 academic year.

### Speakers 2013-2014

6 September Ken Brakke, Susquehanna University
4 October Herman Gluck, University of Pennsylvania
1 November John McCleary, Vassar College
6 December Andrew Hicks, Drexel University
7 February Paul Melvin, Bryn Mawr College
7 March Dennis DeTurck, University of Pennsylvania
4 April David L. Johnson, Lehigh University
2 May 2 Frank Morgan, Williams College

The vertices of the "tetrahedron" in TGTS represent the four
participating institutions. TGTS meets at 4:30 p.m. on the first Friday
of each month. The public is cordially invited to attend.
TGTS Featured in Lancaster Online October 2013

### Next Talk

**Date:** 2 May 2014, 4:30pm
**Location:** Hempfield High School, Room 213
**Speaker:** Frank Morgan, Williams College
**Title:** Chambers Proves LCD Conjecture
**Abstract.**
The celebrated isoperimetric theorem says that the round ball minimizes
perimeter for given volume in R^n. The 2004 Log-Convex Density
Conjecture says that the round ball about the origin minimizes weighted
perimeter for given weighted volume in R^n for any log-convex weight. It
was proved just this past year by Gregory Chambers, a Toronto graduate
student, after a decade of progress, some by undergraduates.

### Past Seminars

### Directions and Contact Information