Example 1.6.6. For \(n = 2\) the three horns \(\Lambda ^2_0\), \(\Lambda ^2_1\) and \(\Lambda ^2_2\) may be displayed as follows:

Commutative diagram generated from the LaTeX source
Commutative diagram generated from the LaTeX source
Commutative diagram generated from the LaTeX source

Generated from the authoritative LaTeX source.