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

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Proof that the second Borel cohomology group of $(\mathbb R, +)$ is trivial

Does anyone have a reference for a fairly direct proof that the second Borel cohomology group for $(\mathbb R, +)$ (with the trivial action on the circle group) is trivial? The motivation is to show t …
Robert VanWesep's user avatar