4 papers
Moment varieties of the inverse Gaussian and gamma distributions are nondefective
Oskar Henriksson, Kristian Ranestad, Lisa Seccia +1
We show that the parameters of a -mixture of inverse Gaussian or gamma distributions are algebraically identifiable from the first moments, and rationally identifiable fr…
What is Positive Geometry?
Kristian Ranestad, Bernd Sturmfels, Simon Telen
This article serves as an introduction to the special volume on Positive Geometry in the journal Le Matematiche. We attempt to answer the question in the title by describing the or…
Chow-Lam Recovery
Elizabeth Pratt, Kristian Ranestad
We study the conditions under which a subvariety of the Grassmannian may be recovered from certain of its linear projections. In the special case that our Grassmannian is projectiv…
Adjoints and Canonical Forms of Tree Amplituhedra
Kristian Ranestad, Rainer Sinn, Simon Telen
We consider semi-algebraic subsets of the Grassmannian of lines in three-space called tree amplituhedra. These arise in the study of scattering amplitudes from particle physics. Ou…