Graphs and Matroids - Jim Geelen

Title: Fragility and circuit-hyperplane relaxation

Abstract:

I will briefly discuss the problem of trying to determine the excluded minors for the class of GF(5)-representable matroids, highlighting the roles of N-fragility and of circuit-hyperplane relaxations. Then I will show a direct relationship between N-fragile matroids and circuit-hyperplane relaxations; this is joint work with Florian Hoersch.