Comment #3 on issue 2082 by andy.terrel: No SymPy class 'Composition'
http://code.google.com/p/sympy/issues/detail?id=2082
I was trying to derive a class from Add:
class TAdd (Add):
pass
Since I didn't put in the identity and zero, the error was called.
AFAIK, we just need to remove the if statement and the class name from
core/core.py. Unless there is some reason this class doesn't exist and it
should.
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