Fundamental domain for the modular group on the upper half plane, vector version
<div style="display:inline-block;padding:0 3px;background-color:#CCF">Original:</div> <div style="display:inline-block;padding:3px 0;"><a href="//commons.wikimedia.org/wiki/User:Kilom691" title="User:Kilom691">Kilom691</a></div> <div style="display:inline-block;padding:0 3px;background-color:#CCF">Vector: </div> <div style="display:inline-block;"><a href="//commons.wikimedia.org/wiki/User_talk:Ahulpke" title="User talk:Ahulpke">Alexander Hulpke</a></div>
CC BY-SA 4.0
Own work based on: <a href="//commons.wikimedia.org/wiki/File:ModularGroup-FundamentalDomain-01.png" title="File:ModularGroup-FundamentalDomain-01.png">ModularGroup-FundamentalDomain-01.png</a>