Interpolation orbits in couples of Lebesgue spaces

Details Interpolation orbits in couples of Lebesgue spaces Interpolation orbits in couples of Lebesgue spaces

2002-12-17

arxiv.org/abs/math/0212229v1

Mathematics

Functional Analysis

13 pages

Scientific paper

We consider linear operators $T$ mapping a couple of weighted $L_p$ spaces $\{L_{p_0}(U_0), L_{p_1}(U_1)\}$ into $\{L_{q_0}(V_0), L_{q_1}(V_1)\}$ for any $1\le p_0$, $ p_1$, $q_0$, $q_1\le\infty$, and describe the interpolation orbit of any $a\in L_{p_0}(U_0)+ L_{p_1}(U_1)$ that is we describe a space of all $\{Ta\}$, where $T$ runs over all linear bounded mappings from $\{L_{p_0}(U_0), L_{p_1}(U_1)\}$ into $\{L_{q_0}(V_0),L_{q_1}(V_1)\}$. We present in this paper the proofs of results which were announced in V.I.Ovchinnikov, C. R. Acad. Sci. Paris Ser. I 334 (2002) 881--884. We show that interpolation orbit is obtained by the Lions--Peetre method of means with functional parameter as well as by the K-method with a weighted Orlicz space as a parameter.

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