30 citations · 80 across the 23 of their papers we have counts for
4 papers · 1 filter
Which Schubert varieties are local complete intersections?
Henning Úlfarsson, Alexander Woo
We characterize by pattern avoidance the Schubert varieties for GL_n which are local complete intersections (lci). For those Schubert varieties which are local complete intersectio…
Describing West-3-stack-sortable permutations with permutation patterns
Henning Úlfarsson
We describe a new method for finding patterns in permutations that produce a given pattern after the permutation has been passed once through a stack. We use this method to describ…
Refined inversion statistics on permutations
Joshua Sack, Henning Úlfarsson
We introduce and study new refinements of inversion statistics for permutations, such as k-step inversions, (the number of inversions with fixed position differences) and non-inver…
On the Representability of Line Graphs
Sergey Kitaev, Pavel Salimov, Christopher Severs +1
A graph G=(V,E) is representable if there exists a word W over the alphabet V such that letters x and y alternate in W if and only if (x,y) is in E for each x not equal to y. The m…