Comments below
> On 10/04/2015, at 04:21, Ralf Stephan <gtrw...@gmail.com> wrote:
>
>
>
> On Thursday, April 9, 2015 at 5:19:54 PM UTC+2, kcrisman wrote:
> The following changed behaviour leads to a few fails:
>
> sage: a,b = var('a b')
> sage: abs(sqrt(x))
> sqrt(abs(x))
> sage: sqrt(abs(x)^2)
> sqrt(x*conjugate(x))
> sage: abs(x)^2
> x*conjugate(x)
>
> What does Maxima do with these? I know that there has been endless
> discussion of what to do with things involving abs, square, and sqrt.
>
> (%i1) abs(sqrt(x));
> (%o1) sqrt(x)
> (%i2) sqrt(abs(x)^2);
> (%o2) abs(x)
> (%i3) abs(x)^2;
> 2
> (%o3) x
That last one is only true if `x` is real. ginac’s answer doesn’t make this
assumption and is more generic than maxima here.
François
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