Convergence of a convex curve to a circle under the <a href="https://en.wikipedia.org/wiki/Curve-shortening_flow" class="extiw" title="en:Curve-shortening flow">curve-shortening flow</a>
<a href="//commons.wikimedia.org/wiki/User:David_Eppstein" class="mw-redirect" title="User:David Eppstein">David Eppstein</a>
<span class="int-own-work" lang="en">Own work</span>