"van Nek" <van.nek at arcor.de> writes:
> I found, that it is the Newton series from 1665
> pi = 6*asin(1/2)
>
> If perhaps the book, you mentioned, is "Algorithmen, Computer,
> Arithmetik" by Arndt and Haenel, you'll find this series on page 217
> (16.55) - or somewhere else.
It is that book. Thanks!
Nicolas
> I should write a short comment in float.lisp
>
> Volker van Nek