3 papers
math.CO2025
The toric g-vector of nestohedra
Richard Ehrenborg, Gábor Hetyei, Margaret Readdy
We show the entries of the toric g-vector of any dual simplicial polytope is a nonnegative integer linear combination of its gamma-vector entries. We give combinatorial interpretat…
math.CO2019
Classification of uniform flag triangulations of the boundary of the full root polytope of type
Richard Ehrenborg, Gábor Hetyei, Margaret Readdy
The full root polytope of type is the convex hull of all pairwise differences of the standard basis vectors which we represent by forward and backward arrows. We completely cla…
math.CO2018
Some combinatorial identities appearing in the calculation of the cohomology of Siegel modular varieties
Richard Ehrenborg, Sophie Morel, Margaret Readdy
In the computation of the intersection cohomology of Shimura varieties, or of the cohomology of equal rank locally symmetric spaces, combinatorial identities involving averag…