Lower bounds for real solutions to sparse polynomial systems |
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Authors: | Evgenia Soprunova Frank Sottile |
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Institution: | a Department of Mathematics, University of Massachusetts, Amherst, MA 01003, USA b Department of Mathematics, Texas A&M University, College Station, TX 77843, USA |
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Abstract: | We show how to construct sparse polynomial systems that have non-trivial lower bounds on their numbers of real solutions. These are unmixed systems associated to certain polytopes. For the order polytope of a poset P this lower bound is the sign-imbalance of P and it holds if all maximal chains of P have length of the same parity. This theory also gives lower bounds in the real Schubert calculus through the sagbi degeneration of the Grassmannian to a toric variety, and thus recovers a result of Eremenko and Gabrielov. |
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Keywords: | 14M25 06A07 52B20 |
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