Illustration of Sarrus' rule.
<a href="//commons.wikimedia.org/w/index.php?title=User:Icktoofay&amp;action=edit&amp;redlink=1" class="new" title="User:Icktoofay (page does not exist)">icktoofay</a>
2012-07-15
<span class="int-own-work" lang="en">Own work</span>