64 citations · 178 across the 18 of their papers we have counts for
26 papers
Extensions of transversal valuated matroids
Alex Fink, Jorge Alberto Olarte
Following up on our previous work, we study single-element extensions of transversal valuated matroids. We show that tropical presentations of valuated matroids with a minimal set…
Answering Two OPAC Problems Involving Banff Quivers
Tucker J. Ervin, Blake Jackson
In a post on the Open Problems in Algebraic Combinatorics (OPAC) blog, E. Bucher and J. Machacek posed three open problems: OPAC-033, OPAC-034, and OPAC-035. These three problems d…
Signed permutohedra, delta-matroids, and beyond
Christopher Eur, Alex Fink, Matt Larson +1
We establish a connection between the algebraic geometry of the type B permutohedral toric variety and the combinatorics of delta-matroids. Using this connection, we compute the vo…
Matroids and the space of torus-invariant subvarieties of the Grassmannian with given homology class
E. Javier Elizondo, Alex Fink, Cristhian Garay López
Let be the complex Grassmannian of affine -planes in -space. We study the problem of characterizing the set of algebraic subvarieties of i…
Gröbner bases, symmetric matrices, and type C Kazhdan-Lusztig varieties
Laura Escobar, Alex Fink, Jenna Rajchgot +1
We study a class of combinatorially-defined polynomial ideals which are generated by minors of a generic symmetric matrix. Included within this class are the symmetric determinanta…
Equivariant K-theory classes of matrix orbit closures
Andrew Berget, Alex Fink
The group acts on , the space of -by- matrices: acts by row operations and scales columns.…