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math.CO2026
A family of algebras that connects positroids, the Theta conjecture, the Delta conjecture, and Eulerian quasisymmetric functions
Hai Zhu
We define a family of algebras whose Hilbert series, when , , and , enumerate certain positroid cells by codimensi…
math.CO2024
Boolean Schubert Structure Coefficients
Yibo Gao, Hai Zhu
The Schubert problem asks for combinatorial models to compute structure constants of the cohomology ring with respect to Schubert classes and has been an important open problem in…