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+'\" et
+.TH J0 "3P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\"
+.SH PROLOG
+This manual page is part of the POSIX Programmer's Manual.
+The Linux implementation of this interface may differ (consult
+the corresponding Linux manual page for details of Linux behavior),
+or the interface may not be implemented on Linux.
+.\"
+.SH NAME
+j0,
+j1,
+jn
+\(em Bessel functions of the first kind
+.SH SYNOPSIS
+.LP
+.nf
+#include <math.h>
+.P
+double j0(double \fIx\fP);
+double j1(double \fIx\fP);
+double jn(int \fIn\fP, double \fIx\fP);
+.fi
+.SH DESCRIPTION
+The
+\fIj0\fR(),
+\fIj1\fR(),
+and
+\fIjn\fR()
+functions shall compute Bessel functions of
+.IR x
+of the first kind of orders 0, 1, and
+.IR n ,
+respectively.
+.P
+An application wishing to check for error situations should set
+.IR errno
+to zero and call
+.IR feclearexcept (FE_ALL_EXCEPT)
+before calling these functions. On return, if
+.IR errno
+is non-zero or \fIfetestexcept\fR(FE_INVALID | FE_DIVBYZERO |
+FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an error has occurred.
+.SH "RETURN VALUE"
+Upon successful completion, these functions shall return the relevant
+Bessel value of
+.IR x
+of the first kind.
+.P
+If the
+.IR x
+argument is too large in magnitude, or the correct result would cause
+underflow, 0 shall be returned and a range error may occur.
+.P
+If
+.IR x
+is NaN, a NaN shall be returned.
+.SH ERRORS
+These functions may fail if:
+.IP "Range\ Error" 12
+The value of
+.IR x
+was too large in magnitude, or an underflow occurred.
+.RS 12 
+.P
+If the integer expression (\fImath_errhandling\fR & MATH_ERRNO) is
+non-zero, then
+.IR errno
+shall be set to
+.BR [ERANGE] .
+If the integer expression (\fImath_errhandling\fR & MATH_ERREXCEPT) is
+non-zero, then the underflow floating-point exception shall be raised.
+.RE
+.P
+No other errors shall occur.
+.LP
+.IR "The following sections are informative."
+.SH EXAMPLES
+None.
+.SH "APPLICATION USAGE"
+On error, the expressions (\fImath_errhandling\fR & MATH_ERRNO) and
+(\fImath_errhandling\fR & MATH_ERREXCEPT) are independent of each
+other, but at least one of them must be non-zero.
+.SH RATIONALE
+None.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "\fIfeclearexcept\fR\^(\|)",
+.IR "\fIfetestexcept\fR\^(\|)",
+.IR "\fIisnan\fR\^(\|)",
+.IR "\fIy0\fR\^(\|)"
+.P
+The Base Definitions volume of POSIX.1\(hy2017,
+.IR "Section 4.20" ", " "Treatment of Error Conditions for Mathematical Functions",
+.IR "\fB<math.h>\fP"
+.\"
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1-2017, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 7, 2018 Edition,
+Copyright (C) 2018 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 .
+.PP
+Any typographical or formatting errors that appear
+in this page are most likely
+to have been introduced during the conversion of the source files to
+man page format. To report such errors, see
+https://www.kernel.org/doc/man-pages/reporting_bugs.html .