BIRS Workshop Lecture Videos

Banff International Research Station Logo

BIRS Workshop Lecture Videos

A-hypergeometric rank jumps from local cohomology in codimension 2 Berkesch, Christine


We construct an explicit local duality map for codimension 2 toric ideals, thanks in part to the explicit free resolutions of Peeva--Sturmfels for such ideals. We then combine this with our work on the parametric behavior of the series solutions of an A-hypergeometric system to explain how local cohomology causes rank jumps.

Item Media

Item Citations and Data


Attribution-NonCommercial-NoDerivatives 4.0 International