zoo is complex infinity (i.e., S.ComplexInfinity). See http://en.wikipedia.org/wiki/One_point_compactification and http://en.wikipedia.org/wiki/Riemann_sphere. If you think of oo (infinity) as the limit of arbitrarily large real numbers, you can think of zoo as the limit of complex numbers with arbitrarily large modulus.
I think the idea behind the name is that "z" represents complex numbers as the symbol most commonly used for complex functions, and "oo" is infinity. By the way, zoo ought to have a docstring. Aaron Meurer On Sat, Feb 25, 2012 at 2:41 AM, Sebastian Haase <[email protected]> wrote: > what is zoo anyway - I was not able to find anything - even on google .... > -Sebastian > PS: sorry for beeing OT .... > > On Sat, Feb 25, 2012 at 10:16 AM, Aaron Meurer <[email protected]> wrote: >> Why is zoo*zoo nan? >> >> In [71]: zoo*zoo >> Out[71]: nan >> >> It seems to me that the result should just be zoo. >> >> Aaron Meurer >> >> -- >> You received this message because you are subscribed to the Google Groups >> "sympy" group. >> To post to this group, send email to [email protected]. >> To unsubscribe from this group, send email to >> [email protected]. >> For more options, visit this group at >> http://groups.google.com/group/sympy?hl=en. >> > > -- > You received this message because you are subscribed to the Google Groups > "sympy" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/sympy?hl=en. > -- You received this message because you are subscribed to the Google Groups "sympy" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/sympy?hl=en.
