Author: Todd_Trimble Format: MarkdownItexAdded some material on the Euler totient function $\phi(n)$.
<a href="https://ncatlab.org/nlab/revision/diff/multiplicative+group+of+integers+modulo+n/5">diff</a>, <a href="https://ncatlab.org/nlab/revision/multiplicative+group+of+integers+modulo+n/5">v5</a>, <a href="https://ncatlab.org/nlab/show/multiplicative+group+of+integers+modulo+n">current</a>
Added some material on the Euler totient function .