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Feb 28, 2008, 12:07:24 PM2/28/08

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If the same bugs exists through numerous software releases,

I think that is valuable public information.

It just should not happen.

-- Brad Cooper

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-- NOT FIXED BUGS ARE DANGEROUS: THEY TEND TO GET MORE SEVERE --

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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 reported here defect persists in the Mathematica versions

since at least 1996 to 2008.

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N[ 2 - Pi/2 - Pi Log[2]/2 ]

NIntegrate[Log[z] Log[1 + Sqrt[1 - z^2]], {z, 0, 1}]

-0.659589

-0.659589

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N[Integrate[Log[z] Log[1 + Sqrt[1 - z^2]], {z, 0, 1}]]

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VERSION OUTPUT RESOLUTION

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Mathematica 6.0 -0.707202 <--------------------------- BUG #3

Mathematica 5.2 Unevaluated <------------------------- BUG #2

Mathematica 4.2 0 <----------------------------------- BUG #1

Mathematica 3.0 -0.659589 OK

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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

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"We must understand that technologies

like these are the way of the future."

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Feb 28, 2008, 12:28:22 PM2/28/08

to

Vladimir Bondarenko <v...@cybertester.com> wrote:

>

> N[ 2 - Pi/2 - Pi Log[2]/2 ]

> NIntegrate[Log[z] Log[1 + Sqrt[1 - z^2]], {z, 0, 1}]

>

> -0.659589

> -0.659589

>

> -----------------------------------------------------------------

>

> N[Integrate[Log[z] Log[1 + Sqrt[1 - z^2]], {z, 0, 1}]]

>

> -----------------------------------------------------------------

> VERSION OUTPUT RESOLUTION

> -----------------------------------------------------------------

>

> Mathematica 6.0 -0.707202 <--------------------------- BUG #3

>

> Mathematica 5.2 Unevaluated <------------------------- BUG #2

>

> Mathematica 4.2 0 <----------------------------------- BUG #1

>

> Mathematica 3.0 -0.659589 OK

>

> N[ 2 - Pi/2 - Pi Log[2]/2 ]

> NIntegrate[Log[z] Log[1 + Sqrt[1 - z^2]], {z, 0, 1}]

>

> -0.659589

> -0.659589

>

> -----------------------------------------------------------------

>

> N[Integrate[Log[z] Log[1 + Sqrt[1 - z^2]], {z, 0, 1}]]

>

> -----------------------------------------------------------------

> VERSION OUTPUT RESOLUTION

> -----------------------------------------------------------------

>

> Mathematica 6.0 -0.707202 <--------------------------- BUG #3

>

> Mathematica 5.2 Unevaluated <------------------------- BUG #2

>

> Mathematica 4.2 0 <----------------------------------- BUG #1

>

> Mathematica 3.0 -0.659589 OK

I am happy to report that this bug has already been fixed in version 6.0.2:

In[9]:= N[Integrate[Log[z] Log[1 + Sqrt[1 - z^2]], {z, 0, 1}]]

Out[9]= -0.659589

But I am unhappy to report that most of the bugs which Vladimir mentioned

in version 6 or 6.0.1 are still present in 6.0.2.

David

Feb 28, 2008, 1:18:11 PM2/28/08

to

On Feb 28, 11:28 am, David W. Cantrell <DWCantr...@sigmaxi.net> wrote:

> I am happy to report that this bug has already been fixed in version 6.0.2:

>

> In[9]:= N[Integrate[Log[z] Log[1 + Sqrt[1 - z^2]], {z, 0, 1}]]

>

> Out[9]= -0.659589

>

> But I am unhappy to report that most of the bugs which Vladimir mentioned

> in version 6 or 6.0.1 are still present in 6.0.2.

>

> David

> I am happy to report that this bug has already been fixed in version 6.0.2:

>

> In[9]:= N[Integrate[Log[z] Log[1 + Sqrt[1 - z^2]], {z, 0, 1}]]

>

> Out[9]= -0.659589

>

> But I am unhappy to report that most of the bugs which Vladimir mentioned

> in version 6 or 6.0.1 are still present in 6.0.2.

>

> David

Right, most of those were fixed in the development version (i.e. what

will be the next major version), not in 6.0.2.

Also, this particular example returns unevaluated (the antiderivative

given by version 3 was not correct in general).

Bhuvanesh

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