3 papers
math.CO2026
Schubitopes are not Ehrhart positive
Yupeng Li, Avery St. Dizier
Schubitopes are a family of generalized permutahedra arising as the Newton polytopes of both Schubert polynomials and Demazure characters of . Monical, Tokcan, and Y…
math.CO2026
Counterexamples to Robichaux's conjecture for Grothendieck polynomials
Avery St. Dizier
Ross and Yong conjectured a -theoretic Kohnert rule for Grothendieck polynomials. Robichaux exhibited a counterexample to the Ross--Yong rule and proposed a revised ghost -Ko…
math.CO2024
Double orthodontia formulas and Lascoux positivity
Linus Setiabrata, Avery St. Dizier
We give a new formula for double Grothendieck polynomials based on Magyar's orthodontia algorithm for diagrams. Our formula implies a similar formula for double Schubert polynomial…