J. M. Berger:
>       Plus, how do you prove the proof? I know of at least two examples
> of software that were proven formally and that AFAIK worked
> perfectly to spec and yet failed spectacularly.

You have to think about proofs as another (costly) tool to avoid bugs/bangs, 
but not as the ultimate and only tool you have to use (I think dsimcha was 
trying to say that there are more costly-effective tools. This can be true, but 
you can't be sure that is right in general).

Bye,
bearophile

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