Robert Dodier wrote on 04/13/2006 09:38:34 AM:
> i'm in favor of replacing the existing factorial with this one
I think, but haven't proved, that Richard's 'k' function
can be used to speed up at least some cases of genfact
(the double factorial, for one case). This reminds me:
The Maxima user documentation for genfact doesn't mention
that it applies entier to the middle argument. (I'll
file a report.) I think commercial macsyma changed this
from entier to ceiling. Do we want ceiling too? The
Maxima documentation says that x !! may differ from
standards for non-integer x. What is the canonical
reference for the double factorial function?
Maxima: (2/3) !! --> 1
Macsyma: (2/3) !! --> 2/3.
Barton