Algebraic Topology
《Algebraic Topology》 · 第 344 页 · Section 14.4
A principal bundle \(EG\to BG\) is universal if every numerable free \(G\)-space admits, up to \(G\)-homotopy, a unique \(G\)-map to \(EG\).
Algebraic Topology
《Algebraic Topology》 · 第 344 页 · Section 14.4
A principal bundle \(EG\to BG\) is universal if every numerable free \(G\)-space admits, up to \(G\)-homotopy, a unique \(G\)-map to \(EG\).
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