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Math Colloquium
Boris Bukh
Carnegie Mellon University
Title: Convex and stairconvex geometries

Abstract: Convex sets are combinatorially complicated because convexity is defined via addition and multiplication. Stairconvex sets are siblings of convex sets, whose definition involves no arithmetic, and that form a geometry of their own. I shall describe the solutions to several problems in classic combinatorial convexity that use stairconvex sets, and will mention the still-mysterious connections with algebraic topology and logic.

Date: Tuesday, January 29, 2013
Time: 4:30 pm
Location: Wean Hall 8220
Submitted by:  Bohman
Note: Refreshments at 4:00 pm, Wean Hall 6220