>
> But the naive approach proposed by the trio of mathematicians can lead 
> one into a false sense of security, because of the amount of code that 
> is published with a license that permits its incorporation into 
> closed-source software. I have shown, beyond any reasonable doubt, 
> that Mathematica 7.0.1 on Solaris used both GMP and ATLAS. 
>
> There is also the possibility that two or more pieces of software make 
> use of an algorithm that is in itself flawed, or from a paper that has 
> a typo. 
>
>
Exactly.  For instance, if the NAUTY/NICE algorithm for graph isomorphism 
had an algorithmic error, the fact that these are two different 
implementations would not be relevant. 

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