Am 01.11.2014 um 13:02 schrieb Sergey B Kirpichev:
(I don't remember, probably this will be invalid too for infinite n. So,
maybe we have a very similar issue for n=-oo due to implicit assumption that n
is a
finite number.)
That's why I wrote:
>> It's hammering Mathematica, but of course bugs like that can happen
>> with any symbolic math software.
> On Fri, Oct 31, 2014 at 11:45:19AM -0700, Richard Fateman wrote:
>> For closed-source commercial programs it is possible to report a
>> bug and have an expert resolve the problem accurately and
>> promptly.
>
> Why this is impossible for open-source programs?
>
>> How likely is this?? I think it depends on
>> (a) how important the bug is
>> (b) how important the person reporting the bug is
>> (c) how much money/lives/etc depend on the bug being fixed.
>
> Apparently, Spain universities doesn't matter for the
> Wolfram Research. Or they count "a serious mistake on the
> determinant operation" as not important.
>
> Worst news - there is an inevitable vendor lock-in. You can't give
> your money someone else (but only single "group of experts", mostly
> anonymous for you) to fix the issue.
That's what I meant with Sympy may be able to milk arguments from this.
Actually I'm not sure that the paper is low-quality. It may not adhere
high scientific quality standards, but it's a very valid reminder about
the pitfalls of relying on software without having understood it. And if
anybody should say "they should": well no they can't, they're
mathematicians, not computer scientists nor computer engineers, which
they would have to be to understand exactly what a CAS can do and what
it cannot. Even with an open source CAS like SymPy they'd have been in
trouble trying to understand what's going on (seeing any C or S
reference should instantly put them in MEGO mode unless accidentally
Python experts).
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