“…[CJ84,CS88,Voi92]. In [SW06] abstract Stein interpolation was proved for the so-called γ-interpolation method, using the complex formulation of the γ-interpolation method in [KLW21].…”
We prove a complex formulation of the real interpolation method, showing that the real and complex interpolation methods are not inherently real or complex. Using this complex formulation, we prove abstract Stein interpolation for the real interpolation method. We apply this theorem to interpolate weighted L p -spaces and the sectoriality of closed operators with the real interpolation method.
“…[CJ84,CS88,Voi92]. In [SW06] abstract Stein interpolation was proved for the so-called γ-interpolation method, using the complex formulation of the γ-interpolation method in [KLW21].…”
We prove a complex formulation of the real interpolation method, showing that the real and complex interpolation methods are not inherently real or complex. Using this complex formulation, we prove abstract Stein interpolation for the real interpolation method. We apply this theorem to interpolate weighted L p -spaces and the sectoriality of closed operators with the real interpolation method.
“…Fourier type has been used in many parts of analysis. For instance in interpolation theory [20,53,67], Fourier multiplier theory [9,34,42,62], evolution equations [1,21,63,69], and geometry of Banach spaces [40,41,54,60].…”
In this paper we study the vector-valued analogues of several inequalities for the Fourier transform. In particular, we consider the inequalities of Hausdorff-Young, Hardy-Littlewood, Paley, Pitt, Bochkarev and Zygmund. The Pitt inequalities include the Hausdorff-Young and Hardy-Littlewood inequalities and state that the Fourier transform is bounded from) under certain condition on p, q, β and γ . Vector-valued analogues are derived under geometric conditions on the underlying Banach space such as Fourier type and related geometric properties. Similar results are derived for T d and Z d by a transference argument. We prove sharpness of our results by providing elementary examples on p -spaces. Moreover, connections with Rademacher (co)type are discussed as well.
“…[6,8,28]. In [26] Stein interpolation was proved for the so-called -interpolation method, using the complex formulation of the -interpolation method in [17].…”
We prove a complex formulation of the real interpolation method, showing that the real and complex interpolation methods are not inherently real or complex. Using this complex formulation, we prove Stein interpolation for the real interpolation method. We apply this theorem to interpolate weighted $$L^p$$
L
p
-spaces and the sectoriality of closed operators with the real interpolation method.
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