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math.CO2017
Topology of posets with special partial matchings
Nancy Abdallah, Mikael Hansson, Axel Hultman
Special partial matchings (SPMs) are a generalisation of Brenti's special matchings. Let a \emph{pircon} be a poset in which every non-trivial principal order ideal is finite and a…
math.CO2017
A word property for twisted involutions in Coxeter groups
Mikael Hansson, Axel Hultman
Given an involutive automorphism of a Coxeter system , let denote the set of twisted involutions. We provide a minimal set of moves that ca…