Axel Hultman

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Given a Coxeter system (W, S) equipped with an involutive automorphism θ, the set of twisted identities is ι(θ) = {θ(w)w | w ∈ W}. We point out how ι(θ) shows up in several contexts and prove that if(More)
Let G be a directed graph, and let ∆ACY G be the simplicial complex whose simplices are the edge sets of acyclic subgraphs of G. Similarly, we define ∆NSC G to be the simplicial complex with the edge(More)