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.
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 CollegeThe 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
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.