Updates:
Cc: fredrik.johansson
Comment #3 on issue 2107 by asmeurer: Real(0.1, 10) - Real(0.1, 10) ->
3.637923296e-13
http://code.google.com/p/sympy/issues/detail?id=2107
The only thing that I can see that is being called differently there is
that Real has __add__ defined but not __sub__ (this just defaults to
Expr.__sub__(), which calls Add(self, -other)). The code for
Real.__add__() is
@_sympifyit('other', NotImplemented)
def __add__(self, other):
if (other is S.NaN) or (self is NaN):
return S.NaN
if isinstance(other, Number):
rhs, prec = other._as_mpf_op(self._prec)
return Real._new(mlib.mpf_add(self._mpf_, rhs, prec, rnd), prec)
return Number.__add__(self, other)
So the solution is just to add a similar Real.__sub__()?
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