UW Combinatorics Talk

UW Combinatorics Seminar

Blending polytopes at simple faces

Fred Holt

University of Washington

October 29, 4:00pm
Padelford C-401

refreshments at 3:30pm
Pre-Seminar at 2:30pm in Padelford C-036

ABSTRACT 

Blending two simple polytopes together at vertices, at edges, or at other supplementary faces, produces another simple polytope. In pursuing the Hirsch conjectures, vertex-blends produced polytopes which have large diameter and few diametral paths. Here we define and explore blends at higher-dimensional faces. We identify specific blendings which would, given the proper inputs, produce counterexamples to the Hirsch conjecture. We also show that the Hirsch conjecture is sharp for dimension 7.


Speaker's Contact Info: http://staff.washington.edu/fbholt


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Sara Billey, Combinatorics Seminar, Mathematics Department, University of Washington,

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