j0 man page on 4.4BSD

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```J0(3)			 BSD Library Functions Manual			 J0(3)

NAME
j0, j1, jn, y0, y1, yn — bessel functions of first and second kind

SYNOPSIS
#include <math.h>

double
j0(double x);

double
j1(double x);

double
jn(int n, double x);

double
y0(double x);

double
y1(double x);

double
yn(int n, double x);

DESCRIPTION
The functions j0() and j1() compute the Bessel function of the first kind
of the order 0 and the order 1, respectively, for the real value x; the
function jn() computes the Bessel function of the first kind of the
integer order n for the real value x.

The functions y0() and y1() compute the linearly independent Bessel
function of the second kind of the order 0 and the order 1, respectively,
for the positive integer value x (expressed as a double); the function
yn() computes the Bessel function of the second kind for the integer
order n for the positive integer value x (expressed as a double).

RETURN VALUES
If these functions are successful, the computed value is returned. On the
VAX and Tahoe architectures, a negative x value results in an error; the
global variable errno is set to EDOM and a reserve operand fault is gen‐
erated.

math(3), infnan(3)

HISTORY
A set of these functions function appeared in Version 7 AT&T UNIX.

4th Berkeley Distribution	April 19, 1994	     4th Berkeley Distribution
```
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