Comment #4 on issue 2007 by smichr: (exp(exp(x))).atoms(exp)
http://code.google.com/p/sympy/issues/detail?id=2007
You can think of the argument to atoms as defining the atoms.
var('xyz')
(x, y, z)
x+y+exp(1/x+y)
x + y + exp(y + 1/x)
_.atoms(Add)
set([x + y + exp(y + 1/x)])
It looks like when you specify a function (or class, like Add) that it
doesn't recurse. I would have expected it to do so. I can look at this
today.
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