"Vladimir Bondarenko" <vb@[EMAIL PROTECTED]
> a écrit dans le message de news:
5d5c99c8-5e9f-4a88-9a5a-f46a94c98876@[EMAIL PROTECTED]
> -----------------------------------------------------------------
> -- NOT FIXED BUGS ARE DANGEROUS: THEY TEND TO GET MORE SEVERE --
> -----------------------------------------------------------------
>
> Quality of CASs is our #1 care.
>
> So our little demo continues.... Hello again from the VM machine
> which hopefully soon will be used by CAS manufacturers to the
> benefit of their customers.
>
> This example demonstrates YET ANOTHER case of bad defects in the
> Wolfram Research Quality Assurance process. Consider, it cannot
> trap and fix efficiently bugs the long livers.
>
> The re****ted here defect persists in the Mathematica versions
> since at least 1996 to 2008.
>
> This is also an example of a MULTIPLE regression bug when the
> invalid answer is now here, now not depending on the concrete
> version.
>
> -----------------------------------------------------------------
>
> N[ - Pi ( Sqrt[3] Pi + 3 (Log[12] - 6) ) / 18 ]
> NIntegrate[Log[1 + z^2]/z^2/(1 + z^6), {z, 0, Infinity}]
>
> 0.890795
> 0.890795
>
> -----------------------------------------------------------------
>
> N[Integrate[Log[1 + z^2]/z^2/(1 + z^6), {z, 0, Infinity}]]
>
> -----------------------------------------------------------------
> VERSION OUTPUT RESOLUTION
> -----------------------------------------------------------------
>
> Mathematica 6.0 0.598308 <------------------------------ BUG #3
>
> Mathematica 5.2 0.890795 OK
>
> Mathematica 4.2 1.8405 <------------------------------ BUG #2
>
> Mathematica 3.0 Integral does not converge <---------- BUG #1
>
> -----------------------------------------------------------------
>
> Best wishes,
>
> Vladimir Bondarenko
>
> VM and GEMM architect
> Co-founder, CEO, Mathematical Director
>
> http://www.cybertester.com/
Cyber Tester, LLC
> http://maple.bug-list.org/
Maple Bugs Encyclopaedia
> http://www.CAS-testing.org/
CAS Testing
>
> -----------------------------------------------------------------
>
> "We must understand that technologies
> like these are the way of the future."
>
> -----------------------------------------------------------------
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