SymPy Documentation (Release 1.4)

[SymPy ⋙ Sage](https://github.com/sympy/sympy/wiki/SymPy-vs.-Sage) SymPy can do [symmetry-finding](http://docs.sympy.org/latest/modules/solvers/ode.html) (Lie methods) for solving ODEs; cf. also [this](https://math.stackexchange.com/q/2174816/128568).