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.