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

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Admissible relations in a Banach algebra

Suppose that $\mathbb{C}\left\langle x, y \right\rangle = R$ is a free (associative and unital) algebra and $f \in R$. I wonder whether there exists a (unital) Banach algebra $A$ and a non-zero pair …
Peter Kosenko's user avatar