Jack Chen-An Chou

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20232026

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math.CO2025

A positive combinatorial formula for the double Edelman--Greene coefficients

Jack Chen-An Chou, Tianyi Yu

Lam, Lee, and Shimozono introduced the double Stanley symmetric functions in their study of the equivariant geometry of the affine Grassmannian. They proved that the associated dou…

math.CO2025

Asymptotically maximal Schubitopes

Jack Chen-An Chou, Linus Setiabrata

We find a layered permutation $w \in S_{n}$ whose Schubert polynomial $S_{w} (x_{1}, \dots, x_{n})$ has support of size asymptotically at least $n! / 4^{n}$ . This gives precise asympto…

math.CO2025

Newton polytopes of fireworks Grothendieck polynomials

Jack Chen-An Chou, Linus Setiabrata

We show that the support of the Grothendieck polynomial $G_{w}$ of any fireworks permutation is as large as possible: a monomial appears in $G_{w}$ if and only if i…