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Simplicial generation of Chow rings of matroids

Christopher Eur, University of California, Berkeley
Wednesday, November 13, 2019 - 3:30pm to 5:00pm
PDL C-401
Christopher Eur

Matroids are combinatorial objects that capture the essence of linear independence.  We first give a gentle introduction to the recent breakthrough in matroid theory, the Hodge theory of matroids, developed by Adiprasito, Huh, and Katz.  By combining two prominent recent approaches to matroids, tropical geometric and Lie/Coxeter theoretic, we give a new presentation for the Chow ring of a matroid that further tightens the interaction between combinatorics and geometry of matroids.  We discuss various applications, including a simplified proof of the main portion of the Hodge theory of matroids.  This is joint work with Spencer Backman and Connor Simpson.