Possible bug in ExpressionNice

[Alex Dikelsky]

Hello,

I think there are parenthesis missing in the output of this:

sage: from sage.manifolds.utilities import ExpressionNice
sage: x,y,u,v = var('x y u v')
sage: f = function('f')(x, y)
sage: ExpressionNice(f.subs(x=u+v,y=u-v).diff(v).diff(u))
d^2(f)/d(u + v)^2 - d^2(f)/du - v^2

I expected the output to be

d^2(f)/d(u + v)^2 - d^2(f)/d(u - v)^2

with parenthesis around  (u - v).

Alex

[Eric Gourgoulhon]

Hi,

Thanks for the report!

This is indeed a bug. It is fixed in

https://trac.sagemath.org/ticket/33399

Eric

[Eric Gourgoulhon]

Le mardi 22 février 2022 à 14:09:08 UTC+1, Eric Gourgoulhon a écrit :

Hi,

Thanks for the report!

This is indeed a bug. It is fixed in

https://trac.sagemath.org/ticket/33399

The fix has been merged in SageMath 9.6.beta4. So the next stable version of SageMath will be free of this bug.
Thanks again for the report!

Eric.

[Alex Dikelsky]

Great, thanks!

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