Diagram showing a false disproof of the <a href="https://en.wikipedia.org/wiki/Four_colour_theorem" class="extiw" title="w:Four colour theorem">this four Colour Theorem</a>.
<div style="display:inline-block;padding:0 3px;background-color:#CCF">Original:</div> <div style="display:inline-block;padding:3px 0;"><a href="https://en.wikipedia.org/wiki/User:Dmharvey" class="extiw" title="en:User:Dmharvey">Dmharvey</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:Inductiveload" title="User:Inductiveload">Inductiveload</a></div>
2007-02-16
Own work based on: <a class="mw-selflink selflink">4CT Non-Counterexample 1.svg</a> <span style="border:1px dotted #FC0;padding:0 4px"><a href="https://en.wikipedia.org/wiki/File:4ct-non-counterexample.png" class="extiw" title="en:File:4ct-non-counterexample.png">this raster image</a></span> <i>by</i> <a href="https://en.wikipedia.org/wiki/User:Dmharvey" class="extiw" title="en:User:Dmharvey">Dmharvey</a> on en.wikipedia.