The Department of Mathematics is holding the first of two events where instructors and assistant professors wh joined the department this fall will speak briefly about their research.3:30 p.m. — Nathaniel Bottman, Postdoctoral Research Fellow                    "Witch trees and the Fulton-MacPherson operad"
3:50 p.m. — Ilya Hautin, Veblen Research Instructor                    "Geometric Expandion of Entropy for Periodic Torus Orbits"
4:10 p.m. — Francesco Lin, Veblen Research Instructor                    "Which homology spheres bound homology balls?"
4:30 p.m. — Tatyana Shcherbina, Assistant Professor                    "Random band matrices: localization length and universality"