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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.