How to use isAlways to compare two symbolic equations ?

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MT on 31 May 2021
Commented: Torsten on 31 May 2021
Dear forum members,
I would like to check wether or not two symbolic equations are the same, but I am not able to do this using isAlways function.
syms a b
f1 = y == abs(x);
f2 = y == sqrt(x^2);
isAlways(f1 == f2)
Warning: Unable to prove '(y == abs(x)) == (y == (x^2)^(1/2))'.
> In symengine
In sym/isAlways (line 42)
ans =
Why do I get these warnings and this (false) answer "logical 0" ? What am I doing wrong ?
Thank you for your help.

Answers (1)

Torsten on 31 May 2021
syms x
Torsten on 31 May 2021
Ok. Then the symbolic toolbox is not able to proove the identity.

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