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Banach spaces, function spaces, real functions, integral transforms, theory of distributions, measure theory.
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Interpolation theory: equivalence of norms
Consider the interpolation space $Z=(X,Y)_{\theta,p}$. In the case $Y\subseteq X$ do we have that, for all $a>0$ the following norm:
$$N_a:x\mapsto\left(\int_{0}^{a} \vert t^{-\theta}k(t,x)\vert^p \fr …