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math.AG2026
The Logarithmic A-Discriminant
Madeleine Goertz, Bernd Sturmfels, Simon Telen
We extend the GKZ theory of discriminants to the setting of Euler integrals where both coefficients and exponents are variables. The integrand is the likelihood function of a toric…
math.AG2026
Positive Geometries from Cubic Surfaces
Bernd Sturmfels, Simon Telen
We present a study of cubic surfaces from the novel perspective of positive geometry. Our positive geometries have dimension two (the surface minus its 27 lines), dimension three (…