Speaker
Alex Fink
Abstract
Delta-matroids are the type BC Coxeter matroids for the short resp. long root; they can also be seen as set systems satisfying a weakening of the matroid basis exchange axiom so that bases may have different sizes. In ongoing work with Chris Eur, Matt Larson and Hunter Spink, we begin extending the intersection-theoretic perspective on matroid theory to delta-matroids, largely following the approach of Berget–Eur–Spink–Tseng. I’ll present some of the combinatorial and geometric consequences.