Un théorème de théorie de la mesure, lié à deux théorèmes de Mokobodzki
Uniqueness and approximate computation of optimal incomplete transportation plans
For α∈(0, 1) an α-trimming, P∗, of a probability P is a new probability obtained by re-weighting the probability of any Borel set, B, according to a positive weight function, f≤1/(1−α), in the way P∗(B)=∫Bf(x)P(dx). If P, Q are probability measures on euclidean space, we consider the problem of obtaining the best L2-Wasserstein approximation between: (a) a fixed probability and trimmed versions of the other; (b) trimmed versions of both probabilities. These best trimmed approximations naturally...
Uniqueness of the polar factorisation and projection of a vector-valued mapping