Comment #19 on issue 1823 by ronan.l...@gmail.com: integral.atoms(Symbol) should introspect
http://code.google.com/p/sympy/issues/detail?id=1823
My point is that there's little semantic difference between i.symbols and i.variables and that it isn't obvious that i.symbols is i.atoms(Symbol) - set(i.variables).
asmeurer: .atoms(Symbol) returns everything already, so we don't have to change anything, but using .symbols instead might be an improvement. For the name, I've thought of .free_symbols.
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