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Tangent Cones of Schubert Varieties for $A_n$ of lower rank (1109.0399v4)
Published 2 Sep 2011 in math.RT and math.SG
Abstract: We calculate the tangent cones at unity of Schubert varieties for $A_n$, where $n$ is less or equal to four. We state several conjectures for an arbitrary $n$.