# Mathematics Colloquia and Seminars

### Tropical Discriminants

Algebra & Discrete Mathematics

 Speaker: Eva Maria Feichtner, Stuttgart and MSRI Location: 1147 MSB Start time: Mon, Nov 27 2006, 12:10PM

We use tropical geometry to take a fresh look at the theory of $A$-discriminants of Gelfand, Kapranov and Zelevinsky. We show that the tropical $A$-discriminant is the Minkowski sum of the row space of $A$ and the Bergman fan of the kernel of $A$. The latter is a well-studied object in geometric combinatorics. As our main application, we present a positive formula for the extreme monomials of the $A$-discriminant, regardless of any smoothness assumption.

This is joint work with Alicia Dickenstein and Bernd Sturmfels.