Hi,
Thanks for the report!
This is indeed a bug. It is fixed in
https://trac.sagemath.org/ticket/33399
Eric
Le dimanche 20 février 2022 à 05:17:55 UTC+1, alexander...@gmail.com a
écrit :
> 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
>
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