Hatcher 0.29

Hatcher, Algebraic Topology, Chapter 0

29. In case the CW complex X is obtained from a subcomplex A by attaching a single cell e^n, describe exactly what the extension of a homotopy f_t:A\to Y to X given by the proof of Proposition 0.16 looks like. That is, for a point x\in e^n, describe the path f_t(x) for the extended f_t.

Proof.

   \square

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