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math.CO2020★ 7 cited
Frozen Pipes: Lattice Models for Grothendieck Polynomials
Ben Brubaker, Claire Frechette, Andrew Hardt +2
We introduce families of two-parameter multivariate polynomials indexed by pairs of partitions -- biaxial double -Grothendieck polynomials -- which specialize at …
math.CO2013★ 2 cited
Combinatorial species and graph enumeration
Andy Hardt, Pete McNeely, Tung Phan +1
In enumerative combinatorics, it is often a goal to enumerate both labeled and unlabeled structures of a given type. The theory of combinatorial species is a novel toolset which pr…