sum for sequences?

Xavier Ho contact at
Tue Apr 6 10:04:32 EDT 2010

On Tue, Apr 6, 2010 at 11:39 PM, Albert van der Horst <
albert at> 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?

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