Comment #1 on issue 3446 by [email protected]: interactions with Float(0.0)
http://code.google.com/p/sympy/issues/detail?id=3446

These (related examples) should also probably give 0.0
    >>> Float(1.0) * Float('0.0')
    0
    >>> Integer(1) * Float('0.0')
    0

I agree with your suggestions. In Mathematica:
    In[1]:= 0. x
    Out[1]= 0.
    In[2]:= x + 0.
    Out[2]= 0. + x
    In[3]:= 1 + 0.0
    Out[3]= 1.


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