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J0(3M) J0(3M) NAME j0, j1, jn, y0, y1, yn - bessel functions SYNOPSIS #include <math.h> double j0(x) double x; double j1(x) double x; double jn(n, x); double x; double y0(x) double x; double y1(x) double x; double yn(n, x) double x; DESCRIPTION These functions calculate Bessel functions of the first and second kinds for real arguments and integer orders. DIAGNOSTICS Negative arguments cause y0, y1, and yn to return a huge negative value and set errno to EDOM. J0(3M)