Comment #2 on issue 2526 by sherjilo...@gmail.com: Making sympy __mul__s return NotImplemented wherever applicable
http://code.google.com/p/sympy/issues/detail?id=2526
They need not be. What I'm saying is all __mul__ functions should have ifs, elifs and elses. They should typecheck and perform multiplications for the types it can, for the others, they should return NotImplemented. So, in short, all __mul__ functions should have `else: return NotImplemented` in the last line, as a rule of thumb.
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