Hello again, I searched the def of int division in R. I could not find it in the english wikipedia, but in the french one, there was http://fr.wikipedia.org/wiki/Division_enti%C3%A8re#Division_euclidienne_dans...: for each pair (a,b) in ZxZ*, there exists (q,r) in ZxZ | a = b*q + r | |r| < |b| This implies that if a xor b is negative, thare are 2 of solutions: the one where (q,r) is equal in absolute value to the solution in N, and (q-1,r+b). So, in the case of -4/3, we have the choice between (-1,-1) and (-2,2). The following discussion in the article does not tell whether one solution is the _official_ one. But: that -4/3 != -(4/3) looks simply wrong for me. Denis ________________________________ vit esse estrany ☣ spir.wikidot.com