Example 3.5.7.27. Let $f: X \rightarrow Y$ be a morphism of Kan complexes. For $n \leq -2$, $f$ exhibits $Y$ as an $n$-truncation of $X$ if and only if $Y$ is contractible. See Example 3.5.7.3.
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Example 3.5.7.27. Let $f: X \rightarrow Y$ be a morphism of Kan complexes. For $n \leq -2$, $f$ exhibits $Y$ as an $n$-truncation of $X$ if and only if $Y$ is contractible. See Example 3.5.7.3.