Sponsored by Elizabethtown College, Franklin and Marshall College, Lebanon Valley College, and Millersville University
16 September: Ziva Myer, Bryn Mawr College 14 October: Vince Coll, Lehigh University 4 November: Carl Droms, James Madison University 2 December: Evan Folkestad, Franklin and Marshall College 3 Feburary: Sarah Rody, Drexel University 10 March: Hannah Schwartz, Bryn Mawr College 7 April: Eamonn Tweedy, Widener UniversityTGTS is a regional mathematics seminar/colloquium. We meet at 4:30 p.m. on the first Friday of each month during the academic year (with some exceptions, as noted in the schedule above). The public is cordially invited to attend.
Date: 7 April 2017, 4:30pm Location: Hempfield High School, Room 213 Speaker: Eamonn Tweedy, Widener University Title: Some invariants of Seifert fibered homology spheres (and of their fibers) Abstract. Seifert fibered spaces (circle bundles over 2-dimensional orbifolds) provide an important playground of 3-manifolds for low-dimensional topologists, and are often used as test cases for conjectures. The also often arise in "nature": as branched double covers of Montesinos knots, as Dehn surgeries on torus knots, and in other settings. This talk, based on joint work with Tye Lidman, will focus on Seifert fibered homology spheres. We use several 3-manifold invariants and knot invariants to shed some light on the homology cobordism types of Seifert fibered homology spheres, as well as the concordance classes of their fibers.