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Makhlin polytopes are Demazure string polytopes

Ghislain Fourier

math.COarXiv:2608.23431

Abstract

We show that Makhlin's polytopes in type Bn are unimodularly equivalent to string polytopes for Demazure modules in type B2n-1. The proof passes through type C, combining Makhlin's diagonal comparison with symplectic FFLV polytopes and the B/C similarity for string cones.

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