Alex Fink

activity

20072023

most citedValuative invariants for polymatroids

64 citations · 178 across the 18 of their papers we have counts for

collaborators

Showing 2019Show all

3 papers · 1 filter

math.AG2019★ 2 cited

Equivariant K-theory classes of matrix orbit closures

Andrew Berget, Alex Fink

The group $G = G L_{r} (k) \times (k^{\times})^{n}$ acts on $A^{r \times n}$ , the space of $r$ -by- $n$ matrices: $G L_{r} (k)$ acts by row operations and $(k^{\times})^{n}$ scales columns.…

math.CO2019

Zero-one Schubert polynomials

Alex Fink, Karola Mészáros, Avery St. Dizier

We prove that if $σ \in S_{m}$ is a pattern of $w \in S_{n}$ , then we can express the Schubert polynomial $S_{w}$ as a monomial times $S_{σ}$ (in reindexed variables)…

math.CO2019★ 8 cited

Presentations of Transversal Valuated Matroids

Alex Fink, Jorge Alberto Olarte

Given $d$ row vectors of $n$ tropical numbers, $d < n$ , the tropical Stiefel map constructs a version of their row space, whose Plücker coordinates are tropical determinants. We expl…