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Complex interpolation of Besov-type spaces on domains. (English) Zbl 1480.46034

Summary: Let \(\Omega\subset\mathbb{R}^d\) \((d\geq 2)\) be a bounded Lipschitz domain. In this article, the author mainly studies complex interpolation of Besov-type spaces on the domain \(\Omega\), namely, we investigate the interpolation \[ [B_{p_0,q_0}^{s_0,\tau_0}(\Omega),B_{p_1,q_1}^{s_1,\tau_1}(\Omega)]_\Theta=B_{p,q}^{\diamond s,\tau}(\Omega) \] under certain conditions on the parameters, where \(B_{p,q}^{\diamond s,\tau}(\Omega)\) denotes the so-called diamond space associated with the Besov-type space. To this end, we first establish the equivalent characterization of the diamond space \(B_{p,q}^{\diamond s,\tau}(\mathbb{R}^d)\) in terms of Littlewood-Paley decomposition and differences. Via some examples, we also show that this interpolation result does not hold under some other assumptions on the parameters or when \(\Omega=\mathbb{R}^d\).

MSC:

46B70 Interpolation between normed linear spaces
46E35 Sobolev spaces and other spaces of “smooth” functions, embedding theorems, trace theorems
Full Text: DOI

References:

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