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Re: Multiple precisions of floating-point arithmetic

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On Sun, 26 Feb 2006, Bradley Lucier wrote:

>Then Colin Percival published his paper "Rapid multiplication modulo
>the sum and difference of highly composite numbers",
>which gives new bounds for the error in FFTs implemented in floating-
>point arithmetic.  This allows you to use FFTs to implement bignum
>arithmetic with inputs of size 256 * (1024)^2 bits in 64-bit IEEE
>arithmetic with proven accuracy.

This is a very interesting potential implementation technique.
Is there a URL for this article that someone who is not a member
of the American Mathematical Society can access?  Or a publication
we can find at a local print library?