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18 February 2025
 
  » arxiv » 1508.0202

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Duality of Multiple Root Loci
Hwangrae Lee ; Bernd Sturmfels ;
Date 2 Aug 2015
AbstractThe multiple root loci among univariate polynomials of degree $n$ are indexed by partitions of $n$. We study these loci and their conormal varieties. The projectively dual varieties are joins of such loci where the partitions are hooks. Our emphasis lies on equations and parametrizations that are useful for Euclidean distance optimization. We compute the ED degrees for hooks. Among the dual hypersurfaces are those that demarcate the set of binary forms whose real rank equals the generic complex rank.
Source arXiv, 1508.0202
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