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19 April 2024
 
  » arxiv » 0709.3306

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A refinement of the Kushnirenko-Bernshtein estimate
Patrice Philippon ; Martin Sombra ;
Date 20 Sep 2007
AbstractA theorem of Kushnirenko and Bernshstein shows that the number of isolated roots of a system of polynomials in a torus is bounded above by the mixed volume of the Newton polytopes of the given polynomials, and this upper bound is generically exact. We improve on this result by introducing refined combinatorial invariants of polynomials and a generalization of the mixed volume of convex bodies: the mixed integral of concave functions.
Source arXiv, 0709.3306
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