On Jul 10, 5:11 pm, Christophe <[email protected]> wrote: > Hello, > I've two questions : > > 1. Is there a way to test is an expression is real ? By expression, I > mean any kind of sympy command.
See expression.is_real. But this will change when the new assumptions system is in place. > 2. Why don't you use +oo rather than oo for the positive > infinity. You should keep oo for complex infinity which is > isusefull for holomorphic function with a zero at infinity for > example. This might be clever, however, in sympy the is currently only "real" infinity. People are used to write limit(..., x, oo). We definitely need complex infinity, there has been a discussion about this (regarding log(0), iirc). Vinzent --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
