Colloquium: Tuesday, November 23, 2021. Speaker: Yael Karshon (Tel Aviv University, University of Toronto). Title: “Symplectic excision”.
Speaker: Yael Karshon (Tel Aviv University, University of Toronto)
Date: Tuesday, November 23, 2021
Title: Symplectic excision
Abstract: Removing a properly embedded ray from a (noncompact) manifold does not affect its topology nor its diffeotype. What about the symplectic analogue of this fact? And can we go beyond rays?
I will show how to use incomplete flows to excise interesting subsets: the product of a ray with a Cantor set; a “ray with two horns”; a “box with a tail”.
This is based on joint work with Xiudi Tang, which answers a question of Alan Weinstein.