Library /sys$common/syshlp/helplib.hlb  —  CRTL  y0,y1,yn  Description
    The y0 functions return the value of the Bessel function of the
    second kind of order 0.

    The y1 functions return the value of the Bessel function of the
    second kind of order 1.

    The yn functions return the value of the Bessel function of the
    second kind of order n.
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