Exercise 1.2.5.2. Show that for $n > 0$, the standard simplex $\Delta ^{n}$ is not a Kan complex (for a more general statement, see Proposition 1.3.5.2).
$\Newextarrow{\xhookrightarrow}{10,10}{0x21AA}$
Exercise 1.2.5.2. Show that for $n > 0$, the standard simplex $\Delta ^{n}$ is not a Kan complex (for a more general statement, see Proposition 1.3.5.2).