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.
   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.


Best regards.
Christophe.

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