1 citations · 1 across the 4 of their papers we have counts for
4 papers
Link complexes of subspace arrangements
Axel Hultman
Given a simplicial hyperplane arrangement H and a subspace arrangement A embedded in H, we define a simplicial complex Delta_{A,H} as the subdivision of the link of A induced by H.…
The combinatorics of twisted involutions in Coxeter groups
Axel Hultman
The open intervals in the Bruhat order on twisted involutions in a Coxeter group are shown to be PL spheres. This implies results conjectured by F. Incitti and sharpens the known f…
A note on blockers in posets
Anders Björner, Axel Hultman
The blocker of an antichain in a finite poset is the set of elements minimal with the property of having with each member of a common predecessor. The following…
Fixed points of involutive automorphisms of the Bruhat order
Axel Hultman
Applying a classical theorem of Smith, we show that the poset property of being Gorenstein over is inherited by the subposet of fixed points under an involutive…