We characterize the weights for the Stieltjes transform and the Calder´on operator to be bounded on the weighted variable Lebesgue spaces $L_w^{p(cdot)}(0,infty)$, assuming that the exponent function $pp$ is log-H"older ...

The width of a closed convex subset of n-dimensional Euclidean space is the distance between two parallel supporting hyperplanes. The Blaschke-Lebesgue problem consists of minimizing the volume in the class of convex sets ...

We give extrapolation results starting from weighted inequalities between Lebesgue and Lipschitz spaces, given by sup B kwχBk∞ |B| 1+ δ n ˆ B |f(x) − mB(f)| dx ≤ C kgwks , (0.1) where 1 < β < ∞, 0 ≤ δ < 1, δ n = 1 β − 1 s ...

Los modelos matemáticos desarrollados en Ciencia e Ingeniería requieren de constantes mejoras y modificaciones, tendientes a una descripción lo más fidedigna posible del comportamiento de fenómenos reales provenientes de ...

We consider the monomial weight |x_1|^{A_1}...|x_n|^{A_n} in R^n, where A_i ≥ 0 is a real number for each i = 1, ..., n, and we present the isoperimetric, Sobolev, Morrey, and Trudinger-Moser inequalities involving this ...

Let 00, denote a net of intervals of the form (x-epsilon,x+epsilon) subset [0,alpha). Let f^{epsilon}(x) be any best constant approximation of f in Lambda_{w,phi´} on B(x,epsilon). Weak inequalities for maximal functions ...

Neste trabalho construímos medidas SRB (Sinai-Ruelle-Bowen) para difeomorfismos locais parcialmente hiperbólicos. A hiperbolicidade parcial será caracterizada pela existência de um campo de cones positivamente invariante ...