Comment #29 on issue 1823 by smi...@gmail.com: integral.atoms(Symbol)
should introspect
http://code.google.com/p/sympy/issues/detail?id=1823
It just has to introspect, I think. Changes have been made in
[ https://github.com/sympy/sympy/pull/44 ]. See the final commit and the
early commit titled "free_symbols,..."
h[1] >>> i=Sum(Sum(y,(y,1,2))+Sum(x**n, (n, 0, oo)), (x, 0, .5))
h[1] >>> i.function
Sum(y, (y, 1, 2)) + Sum(x**n, (n, 0, oo))
h[2] >>> i.variables
[x]
h[3] >>> i.symbols
set([n, x, y])
h[4] >>> i.free_symbols
set([])
h[5] >>> i.bound_symbols
set([n, x, y])
Note: Order and Derivative are slightly different than Integral and Sum in
that they use obj.expr and obj.vars (instead of previous .symbols) rather
than obj.function and obj.variables. Also, vars returns a tuple whereas
variables returns a list. Any recommendations on whether and in which
direction these should be unified?
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