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math.CO2015
Total positivity for the Lagrangian Grassmannian
Rachel Karpman
The stratification of the Grassmannian by positroid varieties has been the subject of extensive research. Positroid varieties are in bijection with a number of combinatorial object…
math.CO2015★ 2 cited
Combinatorics of symmetric plabic graphs
Rachel Karpman, Yi Su
A plabic graph is a planar bicolored graph embedded in a disk, which satisfies some combinatorial conditions. Postnikov's boundary measurement map takes the space of positive edge…