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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "Y0" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" y0 
+.SH NAME
+y0, y1, yn \- Bessel functions of the second kind
+.SH SYNOPSIS
+.LP
+\fB#include <math.h>
+.br
+.sp
+double y0(double\fP \fIx\fP\fB);
+.br
+double y1(double\fP \fIx\fP\fB);
+.br
+double yn(int\fP \fIn\fP\fB, double\fP \fIx\fP\fB); \fP
+\fB
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIy0\fP(), \fIy1\fP(), and \fIyn\fP() functions shall compute
+Bessel functions of \fIx\fP of the second kind of orders
+0, 1, and \fIn\fP, respectively.
+.LP
+An application wishing to check for error situations should set \fIerrno\fP
+to zero and call
+\fIfeclearexcept\fP(FE_ALL_EXCEPT) before calling these functions.
+On return, if \fIerrno\fP is non-zero or
+\fIfetestexcept\fP(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW)
+is non-zero, an error has occurred.
+.SH RETURN VALUE
+.LP
+Upon successful completion, these functions shall return the relevant
+Bessel value of \fIx\fP of the second kind.
+.LP
+If \fIx\fP is NaN, NaN shall be returned.
+.LP
+If the \fIx\fP argument to these functions is negative, -HUGE_VAL
+or NaN shall be returned, and a domain error may occur.
+.LP
+If \fIx\fP is 0.0, -HUGE_VAL shall be returned and a range error may
+occur.
+.LP
+If the correct result would cause underflow, 0.0 shall be returned
+and a range error may occur.
+.LP
+If the correct result would cause overflow, -HUGE_VAL or 0.0 shall
+be returned and a range error may occur.
+.SH ERRORS
+.LP
+These functions may fail if:
+.TP 7
+Domain\ Error
+The value of \fIx\fP is negative. 
+.LP
+If the integer expression (math_errhandling & MATH_ERRNO) is non-zero,
+then \fIerrno\fP shall be set to [EDOM]. If the
+integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero,
+then the invalid floating-point exception shall be
+raised.
+.TP 7
+Range\ Error
+The value of \fIx\fP is 0.0, or the correct result would cause overflow.
+.LP
+If the integer expression (math_errhandling & MATH_ERRNO) is non-zero,
+then \fIerrno\fP shall be set to [ERANGE]. If the
+integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero,
+then the overflow floating-point exception shall be
+raised.
+.TP 7
+Range\ Error
+The value of \fIx\fP is too large in magnitude, or the correct result
+would cause underflow. 
+.LP
+If the integer expression (math_errhandling & MATH_ERRNO) is non-zero,
+then \fIerrno\fP shall be set to [ERANGE]. If the
+integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero,
+then the underflow floating-point exception shall be
+raised.
+.sp
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+On error, the expressions (math_errhandling & MATH_ERRNO) and (math_errhandling
+& MATH_ERREXCEPT) are independent of
+each other, but at least one of them must be non-zero.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIfeclearexcept\fP() , \fIfetestexcept\fP() , \fIisnan\fP() , \fIj0\fP()
+, the Base Definitions volume of
+IEEE\ Std\ 1003.1-2001, Section 4.18, Treatment of Error Conditions
+for
+Mathematical Functions, \fI<math.h>\fP
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group. In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .