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math.CO2014★ 29 cited
Noncrossing sets and a Graßmann associahedron
Francisco Santos, Christian Stump, Volkmar Welker
We study a natural generalization of the noncrossing relation between pairs of elements in [n] to k-tuples in [n] that was first considered by Petersen, Pylyavskyy, Speyer (2010).…
math.CO2008
q,t-Fuss-Catalan numbers for complex reflection groups
Christian Stump
In type A, the q,t-Fuss -Catalan numbers can be defined as a bigraded Hilbert series of a module associated to the symmetric group S_n. We generalize this construction to (finite)…