Comment #7 on issue 2590 by ondrej.c...@gmail.com: jn_zeros in functions/special/bessel.py should return SymPy Floats, not Python floats
http://code.google.com/p/sympy/issues/detail?id=2590
If mpmath provides an actual function for this, and if this function is faster (and more robust) than the sympy one, then I don't see any reasons why to keep the sympy version. So I agree.
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