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math.CO2020
Congruence Normality of Simplicial Hyperplane Arrangements via Oriented Matroids
Michael Cuntz, Sophia Elia, Jean-Philippe Labbé
A catalogue of simplicial hyperplane arrangements was first given by Grünbaum in 1971. These arrangements naturally generalize finite Coxeter arrangements and the weak order throug…
math.CO2018
Cambrian acyclic domains: counting -singletons
Jean-Philippe Labbé, Carsten Lange
We study the size of certain acyclic domains that arise from geometric and combinatorial constructions. These acyclic domains consist of all permutations visited by commuting equiv…