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─────Run-Time Library───────────────────────────────────────────────────────
 
     The _j0, _j1, and _jn routines return Bessel functions of the
     first kind: orders 0, 1, and n, respectively.
 
     The _y0, _y1, and _yn routines return Bessel functions of the
     second kind: orders 0, 1, and n, respectively. The argument <x>
     must be positive.
 
     The long double functions use an 80-bit long double form of
     arguments and return values. In all other respects, they are
     identical to the regular functions.
 
     Return Value
 
     These functions return the result of a Bessel function of <x>.
 
     The _y0, _y1, and _yn routines, if <x> is negative, set errno to
     EDOM, print a _DOMAIN error message to stderr, and return
     -HUGE_VAL.
 
     Error handling can be modified by using the _matherr (or
     _matherrl) routine.
                                    -♦-