Videos

Hyperbolicity, determinants, and reciprocal linear spaces

Presenter
October 12, 2017
Keywords:
  • hyperbolicity
  • stable polynomials
  • determinantal representation
  • matroid
  • hyperplane arrangment
MSC:
  • 14N20
  • 52C35
  • 05B35
  • 14M12
Abstract
A reciprocal linear space is the image of a linear space under coordinate-wise inversion. This nice algebraic variety appears in many contexts and its structure is governed by the combinatorics of the underlying hyperplane arrangement. A reciprocal linear space is also an example of a hyperbolic variety, meaning that there is a family of linear spaces all of whose intersections with it are real. This special real structure is witnessed by a determinantal representation of its Chow form in the Grassmannian. In this talk, I will introduce reciprocal linear spaces and discuss the relation of their algebraic properties to their combinatorial and real structure.