Comment #4 on issue 3540 by asmeu...@gmail.com: not Float('inf') is True http://code.google.com/p/sympy/issues/detail?id=3540
The real test should be to compare against the builtin float: In [4]: not float('inf') Out[4]: False -- You received this message because you are subscribed to the Google Groups "sympy-issues" group. To post to this group, send email to sympy-issues@googlegroups.com. To unsubscribe from this group, send email to sympy-issues+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sympy-issues?hl=en.