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Banach spaces, function spaces, real functions, integral transforms, theory of distributions, measure theory.

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Regularization by mollifier sequence

A well-known feature used in PDE's is the regularization by convolution with a mollifier sequence $\rho_n$, i.e. $\rho_n(x) := n^d \rho(nx)$ with $x \in \mathbb R^d$, $\rho \in C^\infty_c(\mathbb R^d) …
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