19 citations · 22 across the 3 of their papers we have counts for
3 papers
math.CO2012★ 19 cited
Permutations with given peak set
Sara Billey, Krzysztof Burdzy, Bruce Sagan
Let Sym_n denote the symmetric group of all permutations pi = a_1...a_n of {1,...,n}. An index i is a peak of pi if a_{i-1} < a_i > a_{i+1} and we let P(pi) be the set of peaks of…
math.CO2010
Pattern characterization of rationally smooth affine Schubert varieties of type A
Sara Billey, Andrew Crites
Schubert varieties in finite dimensional flag manifolds G/P are a well-studied family of projective varieties indexed by elements of the corresponding Weyl group W. In particular,…
math.AG2010★ 3 cited
Singularities of generalized Richardson varieties
Sara Billey, Izzet Coskun
Richardson varieties play an important role in intersection theory and in the geometric interpretation of the Littlewood-Richardson Rule for flag varieties. We discuss three natura…