The totally nonnegative Grassmannian is a ball

Published 7 Jul 2017 in math.CO, hep-th, and math.GT | (1707.02010v3)

Abstract: We prove that three spaces of importance in topological combinatorics are homeomorphic to closed balls: the totally nonnegative Grassmannian, the compactification of the space of electrical networks, and the cyclically symmetric amplituhedron.

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