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Vers un théorème de Skorohod simultané

Henri Heinich — 2008

Annales de la faculté des sciences de Toulouse Mathématiques

Nous étudions un théorème de Skorohod pour des mesures vectorielles à valeurs d . En notant X ( ) la mesure image de par la variable aléatoire X , nous donnons des classes de mesures et éventuel-lement de variables telles que, si la suite { X n ( ) } converge étroitement, il existe une suite { φ n } , φ n ( ) = X n ( ) qui converge en mesure, éventuel-lement p.s. Le problème de Monge est abordé comme application. Soit | | la mesure variation de , pour un couple ( , ) et une fonction coût c , le problème de Monge est l’existence...

Mass transport problem and derivation

Nacereddine BeliliHenri Heinich — 1999

Applicationes Mathematicae

A characterization of the transport property is given. New properties for strongly nonatomic probabilities are established. We study the relationship between the nondifferentiability of a real function f and the fact that the probability measure λ f * : = λ ( f * ) - 1 , where f*(x):=(x,f(x)) and λ is the Lebesgue measure, has the transport property.

Median for metric spaces

Nacereddine BeliliHenri Heinich — 2001

Applicationes Mathematicae

We consider a Köthe space ( , | | · | | ) of random variables (r.v.) defined on the Lebesgue space ([0,1],B,λ). We show that for any sub-σ-algebra ℱ of B and for all r.v.’s X with values in a separable finitely compact metric space (M,d) such that d(X,x) ∈ for all x ∈ M (we then write X ∈ (M)), there exists a median of X given ℱ, i.e., an ℱ-measurable r.v. Y ∈ (M) such that | | d ( X , Y ) | | | | d ( X , Z ) | | for all ℱ-measurable Z. We develop the basic theory of these medians, we show the convergence of empirical medians and we give some applications....

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