Refinement-order compatibility under T-duality

Consider regular positroidal subdivisions {Γπ}\{\Gamma_{\pi}\} and {Γπ}\{\Gamma_{\pi'}\} of Δk+1,n\Delta_{k+1,n} and corresponding subdivisions {Zπ^}\{Z_{\hat{\pi}}\} and {Zπ^}\{Z_{\hat{\pi'}}\} of An,k,2\mathcal{A}_{n,k,2}. Write {Γπ}{Γπ}\{\Gamma_{\pi}\}\preceq\{\Gamma_{\pi'}\} when the first subdivision refines the second, and similarly for the ZZ-subdivisions. Refinement-order compatibility conjecture. One has {Γπ}{Γπ}\{\Gamma_{\pi}\}\preceq\{\Gamma_{\pi'}\} if and only if {Zπ^}{Zπ^}\{Z_{\hat{\pi}}\}\preceq\{Z_{\hat{\pi'}}\}. This asserts that T-duality preserves the refinement poset of regular subdivisions.

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Primary source

Tomasz Lukowski, Matteo Parisi and Lauren K. Williams, “The positive tropical Grassmannian, the hypersimplex, and the m=2 amplituhedron”, arXiv:2002.06164 (2021).

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