Hello, >> Hi all, >> >> In sage, as of 4.1.1, binomial( -7, 1 ) returns -7. As I understand the >> definition of binomial, this should be 0, since there is no set with -7 >> elements. >> Sage (and others Computer Algebra System) gives 0 for binomial (n>=0, -1) or binomial(n,k>n).
So "sum from k=-infty to +infty of binomial (n, k)" = 2^n. The first n is the cardinal of the set E, and the second k is the cardinal of the subset. I discover today the binomial(n,k) coefficient for n < 0. F. --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
