Abstract : Let us define, for a compact set A ⊂ R n , the Minkowski averages of A: A(k) = a 1 + · · · + a k k : a 1 ,. .. , a k ∈ A = 1 k A + · · · + A k times. We study the monotonicity of the convergence of A(k) towards the convex hull of A, when considering the Hausdorff distance, the volume deficit and a non-convexity index of Schneider as measures of convergence. For the volume deficit, we show that monotonicity fails in general, thus disproving a conjecture of Bobkov, Madiman and Wang. For Schneider's non-convexity index, we prove that a strong form of monotonicity holds, and for the Hausdorff distance, we establish that the sequence is eventually nonincreasing.
https://hal-upec-upem.archives-ouvertes.fr/hal-01590072
Contributeur : Matthieu Fradelizi
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Soumis le : mardi 19 septembre 2017 - 12:32:21
Dernière modification le : jeudi 11 janvier 2018 - 06:12:17
