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 Janet Talvacchia, Swarthmore College 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: 7 March 2014, 4:30pm Location: Hempfield High School, Room 213 Speaker: Dennis DeTurck, University of Pennsylvania Title: Linking Integrals in Three-dimensional Geometries Abstract. Gauss's classical integral formula for the linking number of two curves in R^3 is geometrically natural in the sense that it is invariant under ambient isometries, and there are many proofs of it. We'll look at an approach that produces geometrically natural linking formulas in other three-dimensional geometries (and some higher-dimensional cases if time permits).