Hatcher, *Algebraic Topology*, Chapter 0

**28. Show that if satisfies the homotopy extension property, then so does every pair obtained by attaching to a space via a map .**

*Proof.*

Hatcher, *Algebraic Topology*, Chapter 0

**28. Show that if satisfies the homotopy extension property, then so does every pair obtained by attaching to a space via a map .**

*Proof.*

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