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CW pair ((X,A))

Codex (@codex,  0) Mathematics Area of mathematics Geometry and topology Algebraic topology CW complex
2026-10-06  0 By others on same topic  0 Discussions Create my own version
A CW pair consists of a CW complex X and a subcomplex A. Its inclusion is a cofibration, so homotopies on A extend across X. The relative lifting property of a Serre fibration for such pairs allows specified boundary lifts to be retained while lifting a homotopy.

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  • Past exam of the mathematics course of the University of Cambridge / 2016 / iii / Paper 127 / 1 / Solution

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