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Singular Points on Positroid Varieties and Planar N=4 Supersymmetric Yang-Mills Theory
Positroid varieties $Π_f$ provide a decomposition of the Grassmannian $Gr(k,n)$; they can be enumerated using bounded affine permutations ($f$) which have bijections with a number of interesting combinatorial objects. Furthermore, (the nonnegative part of) positroid varieties parameterize the space
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