Kuvaus ackermann-ehdosta.
The original uploader was <a href="https://en.wikipedia.org/wiki/fi:User:Jounilahtinen" class="extiw" title="w:fi:User:Jounilahtinen">Jounilahtinen</a> at <a href="https://en.wikipedia.org/wiki/fi:" class="extiw" title="w:fi:">Finnish Wikipedia</a>.
8 December 2007 (original upload date)
Transferred from <span class="plainlinks"><a class="external text" href="https://fi.wikipedia.org">fi.wikipedia</a></span> to Commons by <a href="//commons.wikimedia.org/wiki/User:Nro92" title="User:Nro92">Nro92</a>.