What is the best way for a module to test to see if a particular symbol (in my case 't') has been created in the main program? I don't want a function to differentiate with respect to time if 't' has not been created.
--~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
