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Combinatorial formulas for -coordinates in a totally nonnegative Grassmannian [PDF]

Journal of Combinatorial Theory - Series A, 2011
Postnikov constructed a decomposition of a totally nonnegative Grassmannian (Grkn)⩾0 into positroid cells. We provide combinatorial formulas that allow one to decide which cell a given point in (Grkn)⩾0 belongs to and to determine affine coordinates of ...
Talaska, Kelli
exaly   +2 more sources

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