In topology, a branch of mathematics, Borel's theorem, due to Armand Borel (1953), says the cohomology ring of a classifying space or a classifying stack is a polynomial ring.^{[1]}
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Real Analysis, Lecture 13: Compactness and the HeineBorel Theorem

Real Analysis, Lecture 13: Compactness and the HeineBorel Theorem (1/8)

Real Analysis, Lecture 13: Compactness and the HeineBorel Theorem (3/8)
Transcription
See also
Notes
 ^ Behrend 2003, Theorem 6.1.6.
References
 Borel, Armand (1953). "Sur la cohomologie des éspaces fibrés principaux et des éspaces homogènes de groupes de Lie compacts". Annals of Mathematics. 57 (1): 115–207. doi:10.2307/1969728. JSTOR 1969728. MR 0051508.
 Behrend, Kai A. (2003). "Derived ladic categories for algebraic stacks". Memoirs of the American Mathematical Society. 163 (774). doi:10.1090/memo/0774. MR 1963494.
This page was last edited on 9 April 2021, at 18:03