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Math Colloquium
Boris Bukh Carnegie Mellon University, refreshments at 4:00, WeH 6220. 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 8220 Submitted by: Bohman |