Subject: integrate(1/x, x): why ln(x) and not ln(abs(x))?
From: Barton Willis
Date: Mon, 22 Aug 2011 16:53:39 -0500
There is an option variable that alters this:
(%i2) integrate(1/x,x), logabs : false;
(%o2) log(x)
(%i3) integrate(1/x,x), logabs : true;
(%o3) log(abs(x))
On the real line, maybe you would like logabs to be true; off the real
line,
chances are you'll need logabs to be false.
--Barton
maxima-bounces at math.utexas.edu wrote on 08/22/2011 04:34:05 PM:
> From: Humberto Bortolossi <humberto.bortolossi at gmail.com>
> To: maxima at math.utexas.edu
> Date: 08/22/2011 04:33 PM
> Subject: integrate(1/x, x): why ln(x) and not ln(abs(x))?
> Sent by: maxima-bounces at math.utexas.edu
>
> Hi!
>
> Why Maxima developers decided to evaluate
>
> integrate(1/x, x)
>
> as
>
> ln(x)
>
> and not
>
> ln(abs(x))?
>
> Thanks, Humberto.
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