Yichen Ma

activity

20242026

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Showing math.COShow all

3 papers · 1 filter

math.CO2026

Kohnert posets and polynomials of northeast diagrams

Aram Bingham, Beth Anne Castellano, Kimberly P. Hadaway +4

Kohnert polynomials and their associated posets are combinatorial objects with deep geometric and representation theoretic connections, generalizing both Schubert polynomials and t…

math.CO2025

Convex Geometries via Hopf Monoids: Combinatorial Invariants, Reciprocity, and Supersolvability

Yichen Ma

We study the Hopf monoid of convex geometries, which contains partial orders as a Hopf submonoid, and investigate the combinatorial invariants arising from canonical characters. Ea…

math.CO2024

Involution matrix loci and orbit harmonics

Moxuan J. Liu, Yichen Ma, Brendon Rhoades +1

Let $Mat_{n \times n} (C)$ be the affine space of $n \times n$ complex matrices with coordinate ring $C [x_{n \times n}]$ . We define graded quotie…