This material has been published in
Lotharingien Combin. 45 (2001), Article B45c, 11 pp.
On multiplicities of points on Schubert varieties in
We answer some questions related to multiplicity formulas by Rosenthal
and Zelevinsky and by Lakshmibai and Weyman for points on Schubert
varieties in Grassmannians. In particular, we give combinatorial
interpretations in terms of nonintersecting lattice paths of these
formulas, which makes the equality of the two formulas immediately
obvious. Furthermore we provide an alternative determinantal formula
for these multiplicities, and we show that they count semistandard
tableaux of unusual shapes.
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