[Maxima] Wrong simplification of log(1/z)
robert.dodier at gmail.com
Tue Jul 29 21:19:39 CDT 2008
On 7/29/08, Dieter Kaiser <drdieterkaiser at web.de> wrote:
> O.k., I have tried to implement plog to get the correct phase factors in the
> transformations. But plog is very annoying. I don't get it silent. I try to
> declare almost everything to be complex, but it still continue to ask the
> useless question: Is "THIS" positive or negative?
Well, that is certainly frustrating. I'm guessing that these questions
originate from carg, cabs, imagpart, and/or realpart, not plog itself.
I am in favor of making those 4 functions less vocal.
> I had again a look at the Log function. I think log(1/z) -> -log(z) is really a
Agreed, it really is a bug.
> There is no reason to do the wrong simplification for log(1/z). It my opinion
> there is also no reason to do the simplification log(a/b)->log(a)-log(b) when we
> are not sure that a,b are real or complex and not negative real.
Agreed, Maxima should never make unjustified simplifications.
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