Comment #1 on issue 2006 by Vinzent.Steinberg: functor objects
http://code.google.com/p/sympy/issues/detail?id=2006
I like this idea, but I'm not sure about the proposed behavior.
expr.subs(sin**2 + cos**2, 1)
I would expect this to also replace sin(2*x)**2 + cos(3*x)**2.
(f + id(1))(x, y) == f(x, y) + x
Shouldn't it be
(f + id(1))(x,y) == (f + 1)(x, y) == f(x, y) + 1
?
For the behavior you propose I think it should be called differently than
id().
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