Ep 23: The Whitehead Lemma, Chapter 2(b): The homotopy relation in a model category
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We conclude this section on homotopy of morphisms in a model category with the proof of a crucial lemma, which generalizes a famous result from classical homotopy theory of spaces: the Whitehead Lemma. I prove in this lecture that a morphism between bifibrant objects is a weak equivalence if and only if it is a homotopy equivalence.
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