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CRTL, y0,y1,yn, Return Values
 *Conan The Librarian 

    x                  The relevant Bessel value of x of the second
                       kind.
    -HUGE_VAL          The x argument is 0.0; errno is set to ERANGE.
    NaN                The x argument is negative or NaN; errno is
                       set to EDOM.
    0                  Underflow occurred; errno is set to ERANGE.
    HUGE_VAL           Overflow occurred; errno is set to ERANGE.
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