Updates:
Labels: -Milestone-Release0.7.0 Milestone-Release0.7.1
Comment #16 on issue 2283 by asmeurer: Non-iterative 'in'
http://code.google.com/p/sympy/issues/detail?id=2283
If we want `in` to do more, we can just push in Mateusz's patch. If we
want `in` to do less, it is nontrivial to fix, because `has` and `in` both
use each other.
It's looking like the latter, i.e., `a in expr` should be equivalent to `a
in expr.args`. But as I said, it's nontrivial, and no one seems to want to
work on it, so I am postponing this issue.
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