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The algebraic and combinatorial structure of generalized permutahedra

Positivity Questions in Geometric Combinatorics July 10, 2017 - July 21, 2017

July 19, 2017 (02:00 PM PDT - 03:00 PM PDT)
Speaker(s): Federico Ardila (San Francisco State University)
Location: MSRI: Simons Auditorium
Video

23-Ardila

Abstract

Generalized permutahedra are a beautiful family of polytopes with a rich combinatorial structure. We explore the Hopf algebraic structure of this family. We then use this structure to unify old results, prove new results, and answer open questions about many objects of interest, such as graphs, matroids, posets, trees, set partitions, building sets, hypergraphs, and simplicial complexes. In particular, we shed new light on the basic problem of inverting a power series.

The talk will be based on joint work with Marcelo Aguiar, and will assume no previous knowledge of Hopf algebras or generalized permutahedra.

 

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23-Ardila

H.264 Video 23-Ardila.mp4 200 MB video/mp4 rtsp://videos.msri.org/data/000/029/011/original/23-Ardila.mp4 Download
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