Comment #3 on issue 2283 by hector1...@gmail.com: Non-iterative 'in'
http://code.google.com/p/sympy/issues/detail?id=2283
To check expr in EXPR, we can do,
for i in expr.args:
if i not in EXPR:
return FALSE
return True
I think this will serve the purpose.
And thanks for reminding me about this. I will work on this.
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