Can anyone explain the proofs of a 1973 theorem of D. Wigner asserting that the cohomology of BG is isomorphic to the Borel cohomology of G, where G is a locally compact group? Ref: Theorem 4 in Zbl 0264.22001 Wigner, David Algebraic cohomology of topological groups. (English) Trans. Am. Math. ... Continue reading »