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BESSEL(3M)                                                          BESSEL(3M)



NAME
       j0, j1, jn, y0, y1, yn - Bessel functions

SYNOPSIS
       #include <&lt;math.h>&gt;

       double j0(x)
       double x;

       double j1(x)
       double x;

       double jn(n, x)
       double x;
       int n;

       double y0(x)
       double x;

       double y1(x)
       double x;

       double yn(n, x)
       double x;
       int n;

DESCRIPTION
       These  functions  calculate  Bessel  functions  of the first and second
       kinds for real arguments and integer orders.

SEE ALSO
       exp(3M)

DIAGNOSTICS
       The functions y0, y1, and yn have logarithmic singularities at the ori-
       gin,  so  they  treat  zero and negative arguments the way log does, as
       described in exp(3M).  Such arguments are unexceptional for j0, j1, and
       jn.



                                6 October 1987                      BESSEL(3M)