The entropic discriminant |
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Authors: | Raman Sanyal Bernd Sturmfels Cynthia Vinzant |
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Affiliation: | 1. Institut für Mathematik, Freie Universität Berlin, Germany;2. Department of Mathematics, University of California, Berkeley, USA;3. Department of Mathematics, University of Michigan, Ann Arbor, USA |
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Abstract: | The entropic discriminant is a non-negative polynomial associated to a matrix. It arises in contexts ranging from statistics and linear programming to singularity theory and algebraic geometry. It describes the complex branch locus of the polar map of a real hyperplane arrangement, and it vanishes when the equations defining the analytic center of a linear program have a complex double root. We study the geometry of the entropic discriminant, and we express its degree in terms of the characteristic polynomial of the underlying matroid. Singularities of reciprocal linear spaces play a key role. In the corank-one case, the entropic discriminant admits a sum of squares representation derived from the discriminant of a characteristic polynomial of a symmetric matrix. |
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Keywords: | Matroid Discriminant Hyperplane arrangement Ramification locus Fully real system |
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