Comment #22 on issue 1823 by asmeurer: integral.atoms(Symbol) should introspect
http://code.google.com/p/sympy/issues/detail?id=1823
My favorites so far are "free_symbols" and "proper_symbols", leaning slightly toward the second.
"independent_symbols" sounds like the opposite (the ones that don't matter). "constants" sounds like it would return all the numbers in the expression (pi, 3, E, …). We should definitely use "symbols" or even "Symbols" instead of "variables" because that is the SymPy name for them.
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