sum for sequences?

[Xavier Ho]

On Tue, Apr 6, 2010 at 11:39 PM, Albert van der Horst <
albert at spenarnc.xs4all.nl> wrote:

> Now for floating point numbers the order of summation is crucial,
> not commutative  (a+b)+c <> a+(b+c).
>

Could you shed some light on why is this?

Cheers,
Xav
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-list/attachments/20100407/0490d6c0/attachment-0001.html>