Bourbaki

Exercise 4, § 6

Tag 041V, permanent. Cite it as [Bourbaki, Tag 041V].

Algebraic Topology, IV, p. 479

By considering a complex Hilbert space, construct analogously a metrizable classifying space for the unitary group U(n,C)U(n,\mathbf{C}) (LIE, IX, §, no4^o4, p. 21)

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Machine translation of the English, by gpt-5-mini. Not checked by a person. That model is a cut down version of the one the rest of this language was written by.