Re: Fwd: Copyright infringement in linux/drivers/usb/serial/keyspan*fw.h

[Alexander Viro]

On 25 May 2001, Andreas Jaeger wrote:

> We have comments in the code that state how j0 is build, and R0/S0
> come from some expansion:
>  * Bessel function of the first and second kinds of order zero.
>  * Method -- j0(x):
>  *    1. For tiny x, we use j0(x) = 1 - x^2/4 + x^4/64 - ...
>  *    2. Reduce x to |x| since j0(x)=j0(-x),  and
>  *       for x in (0,2)
>  *            j0(x) = 1-z/4+ z^2*R0/S0,  where z = x*x;
>  *       (precision:  |j0-1+z/4-z^2R0/S0 |<2**-63.67 )
> 
> Andreas

Sure. However, the question about choosing the polynomials stands.
(And no, I'm not proposing to go and bugger glibc folks over that ;-)

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