Home / Essays and theses / Erratum 1.04

Conventions
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I would like to thank Philippe Gaucher for sending typos.

Ch. 1, page 16, l. 2
In this case, the morphism $g$ is a weak equivalence in $\mathcal{C}$.
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In this case, the morphism $f$ is a weak equivalence in $\mathcal{C}$.