ategory_003a-Package-combinatorics">Package combinatorics</a>
</div>
</p>
</dd></dl>

<p><a name="perm_005finverse"></a>
<a name="Item_003a-perm_005finverse"></a>
</p><dl>
<dt><u>Function:</u> <b>perm_inverse</b><i> (<var>p</var>)</i>
<a name="IDX1472"></a>
</dt>
<dd><p>Returns the inverse of a permutation of <var>p</var>, namely, a permutation
<var>q</var> such that the products <var>pq</var> and <var>qp</var> are equal to the
identity permutation: [1, 2, 3, &hellip;, <var>n</var>], where <var>n</var> is t