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On a metric measure space (X,ϱ,μ), consider the weight functions
if ϱ(x,z₀) < 1,
if ϱ(x,z₀) ≥ 1,
if ϱ(x,z₀) < 1,
if ϱ(x,z₀) ≥ 1,
where z₀ is a given point of X, and let be an operator kernel satisfying
for all x,y ∈ X such that ϱ(x,y) < 1,
for all x,y ∈ X such that ϱ(x,y)≥ 1,
where 0 < a < min(d,D), and d and D are respectively the local and global volume growth rate of the space X. We determine conditions on a, α₀, α₁, β₀, β₁ ∈ ℝ for the Hardy-Littlewood-Sobolev operator...
Le but de cet article est d’étendre les résultats classiques (inégalité de Hardy-Littlewood-Sobolev, inégalité de Hedberg) sur l’intégrale fractionnaire à deux types différents d’espaces métriques mesurés : les espaces métriques mesurés à mesure doublante d’une part, les espaces métriques mesurés à croissance polynomiale du volume d’autre part. Les deux résultats principaux que nous obtenons sont les suivants :
Etant donné un espace métrique mesuré de type homogène, étant donnés ...
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