Comment #1 on issue 2114 by smichr: Mul.make_args(S.One) returns () http://code.google.com/p/sympy/issues/detail?id=2114
I see that the class.identity is being used to decide to return a null set, but then anything that depends on getting modifiable args has to fiddle around with checking if the object is the identity. Wouldn't it be better to simply return the class.identity?
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