On 09/04/15 18:47, Julien Puydt wrote:
Le Thu, 09 Apr 2015 18:38:24 +0200,
Vincent Delecroix <[email protected]> a écrit :
Hello,
I found
sage: abs(sqrt(x))
sqrt(abs(x))
much better than
(%i1) abs(sqrt(x));
(%o1) sqrt(x)
We discussed in #15605 that variables in the symbolic ring should be
thougt as complex variables (if not specified otherwise). The maxima
version is wrong when x is real negative.
What is the answer to
sage: sqrt(abs(x)**2) == abs(x)
sage: abs(x**2)
sage: (-1)^(2/3) # see ticket 15605
I can't help but notice that under the convention that sqrt is a
function from non-negative reals to non-negative reals, what maxima
does makes perfect sense.
True. Let me add that I did not say that maxima is wrong but that maxima
is wrongly used in Sage. (perhaps implicitly)
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