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arxiv: 1111.4809 · v2 · pith:BILRATYDnew · submitted 2011-11-21 · 🧮 math.SG · math.AG

Toric degenerations of integrable systems on Grassmannians and polygon spaces

classification 🧮 math.SG math.AG
keywords integrablepolygonpotentialrelatedsystemassociatedberensteincompletely
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We introduce a completely integrable system on the Grassmannian of 2-planes in an n-space associated with any triangulation of a polygon with n sides, and compute the potential function for its Lagrangian torus fiber. The moment polytopes of this system for different triangulations are related by an integral piecewise-linear transformation, and the corresponding potential functions are related by its geometric lift in the sense of Berenstein and Zelevinsky.

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Cited by 1 Pith paper

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    Singular fibers in type (ii) compactified Ruijsenaars-Schneider systems are smooth connected isotropic submanifolds, diffeomorphic to S^3 over singular vertices of the action polytope in simple cases.