rt{&lt;f, f&gt;}\)</span></p></li>
<li><p><strong>diffeomorphism</strong> is an <a class="reference external" href="https://en.wikipedia.org/wiki/Isomorphism">isomorphism</a> of <a class="reference external" href="https://en.wikipedia.org/wiki/Smooth_manifold">smooth manifolds</a>. It is an <a class="reference external" href="https://en.wikipedia.org/wiki/Invertible_function">invertible function</a> that <a class="reference external" href="https://en.wikipedia.org/wiki/Map_(mathematics)">maps</a> one <a cla