illustration of the schiffler point, which is the intersection of the 3 euler lines e<sub>1</sub>, e<sub>2</sub>, e<sub>3</sub>
<a href="//commons.wikimedia.org/wiki/User:Kmhkmh" title="User:Kmhkmh">Kmhkmh</a>
CC BY 4.0
<span class="int-own-work" lang="en">Own work</span>