Michele, So I think the patch you had plus tests testsuite/tr1/5_numerical_facilities/special_functions/09_cyl_bessel_j/check_value.cc testsuite/tr1/5_numerical_facilities/special_functions/11_cyl_neumann/check_value.cc plus I'd like the new tests also in testsuite/special_functions/08_cyl_bessel_j/check_value.cc testsuite/special_functions/10_cyl_neumann/check_value.cc for C++17.
Put that up with a Changelog and see if we're all good. Thank you for going through this and other math issues. Ed
