$F$- and $H$-Triangles for $\nu$-Associahedra

Abstract

For any northeast path $\nu$, we define two bivariate polynomials associated with the $\nu$-associahedron: the $F$- and the $H$-triangle. We prove combinatorially that we can obtain one from the other by an invertible transformation of variables. These polynomials generalize the classical $F$- and $H$-triangles of F.~Chapoton in type $A$. Our proof is completely new and has the advantage of providing a combinatorial explanation of the relation between the $F$- and $H$-triangle.

25 pages, 15 figures. Comments are very welcome

References in corpus (1)

• Revisiting Generalizations of the Dehn--Sommerville Relations

Cited by in corpus (1)

• Bubble Lattices II: Combinatorics