Algebraic Topology - 11.3 - Homotopy Equivalence

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We sketch why that the homotopy category is a category.
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I have to read Spanier's book on Algebraic Topology and couldn't understand what a homotopy equivalence is. This helped me!! Thank you!

mayaschoenfeld
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What text book would you recommend for graduate Algebraic Topology? Is there a text for which you based this playlist?
Thanks

hugoallen
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I'd been watching your Derived Category videos just 5-6 days ago.
😃

arkapointer