>Hei,Oleg, I am afraid that you are barking under the wrong tree.
The problem of calculation precision depends mostly on the problem
singularity AND computational formula's representation. There exists a
whole discipline of computational error spreading in the parsing  tree,
f.e. W.Miller. SIAM J on Computing June 1976, Graph transformations for
roundoff analysis.
Just adding n numbers makes your result faulty by SQR(n) last exact units ...
With best regards Leo




 Intention is an aspect of the actor. And with
> multiple actors, such as a system and a user,
> the intentions may not coincide.
> When building a model of calculation in a partilar
> system the user may obtain unintended results.
> This is the meaning of "unintended" that was used.
> Another word could be "counterintuitive", that is
> contrary to common-sense expectations, but true.
>
>


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