Speaker
Matt Baker (Georgia Tech)
Date
Fri, Apr 5 2024, 12:00pm
Location
383N
We give a new proof, along with some generalizations, of a folklore theorem - attributed to Laurent Lafforgue - that a rigid matroid (i.e., a matroid whose base polytope is indecomposable) has only finitely many projective equivalence classes of representations over any given field. A key ingredient in the proof is a generalization of the category of commutative rings which we call bands.