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For a planar directed graph G, Postnikov's boundary measurement map sends positive weight functions on the edges of G onto the appropriate totally nonnegative Grassmann cell.
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G. Lawler, Intersections of Random Walks
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G. Lusztig, Introduction to total positivity, Positivity in Lie theory: open problems , 133–145, de Gruyter Exp. Math., 26, de Gruyter, Berlin, 1998
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K. Rietsch, An algebraic cell decomposition of the nonnegative part of a flag variety, J. Algebra
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S. Fomin and A. Zelevinsky, Total positivity: tests and parametrizations, Math. Intelligencer
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S. Fomin, Loop-erased walks and total positivity, Trans. Amer. Math. Soc
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D. Speyer and L. Williams, The tropical totally positive Grassmannian, J. Algebraic Combin
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K. Rietsch, Closure relations for totally nonnegative cells in G / P G/P , Math. Res. Lett
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J. Scott, Grassmannians and cluster algebras. Proc. London Math. Soc
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A. Postnikov, Total positivity, Grassmannians, and networks, version of October 17, 2007, http://math.mit.edu/ ~ \tilde{\ } apost/papers.html
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