Hi Peter, do you know how to open a trac ticket? As you say, this extension can easily be done and thus does probably not require a poll on sage-devel.
Best regards, Simon On 2014-10-09, Peter Luschny <peter.lusc...@gmail.com> wrote: > ------=_Part_1724_1802019516.1412847516854 > Content-Type: text/plain; charset=UTF-8 > > A simple and coherent extension of the binomial function > to negative integers n, k was outlined by M. J. Kronenburg in > The Binomial Coefficient for Negative Arguments, > http://arxiv.org/abs/1105.3689 > > This extension amounts to define > > def BINOMIAL(n, k): > if n >= 0 and k >= 0: > return binomial(n, k) > if k >= 0: > return (-1)^k*binomial(-n+k-1, k) > if k <= n: > return (-1)^(n-k)*binomial(-k-1, n-k) > return 0 > > (Here BINOMIAL is the extended version, binomial the > implemented version.) > > The benefit, among other things, is: Accordance with the > behaviour of Maple and Mathematica. > > Peter > > (Thanks to John Palmieri for the reference.) > -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at http://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
