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Intégration des fonctions sous-analytiques et volumes des sous-ensembles sous-analytiques

Jean-Marie Lion, Jean-Philippe Rolin (1998)

Annales de l'institut Fourier

Soit f ( x , y ) une fonction sous-analytique de R n × R m à valeurs dans R + . Nous montrons que l’intégrale R m f ( x , y ) d y est une fonction log-analytique de x . Nous en déduisons que le volume k -dimensionnel des éléments Y x d’une famille sous-analytique de sous-ensembles sous-analytiques globaux de l’espace euclidien R m est une fonction log-analytique de x . Un corollaire de ce résultat est le caractère log-analytique de la fonction densité k -dimensionnelle d’un sous-analytique global de dimension k en tout point de sa fermeture topologique....

Intersection of analytic curves

Tadeusz Krasiński, Krzysztof Jan Nowak (2003)

Annales Polonici Mathematici

We give a relation between two theories of improper intersections, of Tworzewski and of Stückrad-Vogel, for the case of algebraic curves. Given two arbitrary quasiprojective curves V₁,V₂, the intersection cycle V₁ ∙ V₂ in the sense of Tworzewski turns out to be the rational part of the Vogel cycle v(V₁,V₂). We also give short proofs of two known effective formulae for the intersection cycle V₁ ∙ V₂ in terms of local parametrizations of the curves.

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