Cool pictures produced with Sage-Combinat
![[ATTACH]](/combinat/CoolPictures?action=AttachFile&do=upload_form&ticket=006628e2b9.4fdafea56dfad32dcfa73ff6cfa9cb29f86aa4d6&target=logo_UFR.png "[ATTACH]"){kind=small}
Graph representing the Cartan matrix of the monoid of upper unitriangular boolean 5x5 matrices
I can't resist quoting Tom Denton: First they tell us we will never need more than 640k of RAM, then they tell us our documents should always be less than the length of a limousine...