Compact composition operators on Hardy-orlicz spaces

Ajay K. Sharma; S. D. Sharma

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Given a sublinear operator T satisfying that ||Tf||_L^p(ν) ≤ C/(p-1) ||f||_L^p(μ), for every 1 < p ≤ p₀, with C independent of f and p, it was proved in [C] that... [check the paper abstract for the formula] This estimate implies that T: L log L → B, where B is a rearrangement invariant space. The purpose of this note is to give several...

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In questo lavoro si studiano condizioni sufficienti sulla funzione peso $V$ , espresse in termini di integrabilità, per la validità della disuguaglianza ${(\int_{B} u^{2} (x) V (x) d x)}^{\frac{1}{2}} \leq c {(\int_{B} {(\nabla u (x))}^{2} d x)}^{\frac{1}{2}},$ dove $B$ denota una sfera in $R^{N}$ . Usando una tecnica di decomposizione di immersioni si dimostrano condizioni sufficienti in termini di appartenenza a spazi di Lebesgue, Lorentz-Orlicz e/o di tipo debole. Come applicazioni vengono fornite condizioni sufficienti per la proprietà forte di prolungamento unico per $|Δ u| \leq V |u|$ nelle dimensioni 2 e 3. ...

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Let $Ω$ be a bounded open set in $ℝ^{n}$ , $n \geq 2$ . In a well-known paper , 20, 1077–1092 (1971) Moser found the smallest value of $K$ such that $sup \{\int_{Ω} exp ({(\frac{|f (x)|}{K})}^{n / (n - 1)}) : f \in W_{0}^{1, n} (Ω), {∥ \nabla f ∥}_{L^{n}} \leq 1\} < \infty .$ We extend this result to the situation in which the underlying space $L^{n}$ is replaced by the generalized Zygmund space $L^{n} {log}^{n - 1} L {log}^{α} log L$ $(α < n - 1)$ , the corresponding space of exponential growth then being given by a Young function which behaves like $exp (exp (t^{n / (n - 1 - α)}))$ for large $t$ . We also discuss the case of an embedding into triple and other multiple exponential cases.