Geodesic
Recognizing Schubert cells.
Journal of Algebraic Combinatorics, Tome 12 (2000) no. 1, pp. 37-57.

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Summary: We address the problem of distinguishing between different Schubert cells using vanishing patterns of generalized Plücker coordinates.
Classification : In, figure, 1,, we, represent, this, stratification, by, a, graph, (actually,, the, Hasse, diagram, of, a, poset), whose, 11, vertices, are, labelled, by, the, vanishing, patterns, and, whose, edges, show, how, the, subcells, degenerate, into, each, other, when, a, condition, of, the, form, pI, =, 0, is, replaced, by, pI, =, 0
Keywords: Schubert cell, Schubert variety, flag manifold, plücker coordinate, Bruhat cell, vanishing pattern 
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     title = {Recognizing {Schubert} cells.},
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Fomin, Sergey; Zelevinsky, Andrei. Recognizing Schubert cells.. Journal of Algebraic Combinatorics, Tome 12 (2000) no. 1, pp. 37-57. http://geodesic.mathdoc.fr/item/JAC_2000__12_1_a4/