In Hatcher top of page 125, I do not understand where the first isomorphism comes from. He says it comes from the exact sequence of the pair, using the fact that CA is contractible, but what is the precise line of reasoning here?(adsbygoogle = window.adsbygoogle || []).push({});

Hatcher's book: http://www.math.cornell.edu/~hatcher/AT/AT.pdf

Thanks!

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# Homology question

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