Skew-symmetric Vanishing Lattices and Intersections of Schubert Cells
B. Shapiro, M. Shapiro, A. Vainshtein
math.AGarXiv:math/9802093
Abstract
We prove that the number of connected components in the intersection of two open opposite Schubert cells in the variety of complete real n-dimensional flags equals 3*2n-1 for n>5.
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