Nash equilibria and A-discriminants

We study the $A$-discriminant of a matrix $A$ whose columns give the Nashtope of an $n$-player binary game with $n \ge 3$. This $A$-discriminant is a subset of the Nash discriminant variety introduced in [Abo--Portakal--Sodomaco 2026]. We compute the (co)dimension and degree of this discriminant. If time permits, we will also discuss the degree and (co)dimension calculation for all balanced games, including those of boundary format. This is based on joint work with Elke Neuhaus, Irem Portakal, and Luca Sodomaco.