Conflict with operatorname symbol redifinition

[jebej]

There is a conflict between unicode-math and here the redefinition of amsmath's \Re and \Im involving \operatorname

\renewcommand{\Re}{\operatorname{Re}}

The issue was originally noticed with the physics package, which does a similar redefinition.

When unicode-math is loaded, the old fraktur symbol is printed:

\documentclass{article}
\usepackage{unicode-math} % comment out for correct output
\usepackage{amsmath}

\renewcommand{\Re}{\operatorname{Re}}

\begin{document}
The real part of $z$ is $\Re{z}$.
\end{document}

The correct output should have the roman "Re":

[davidcarlisle]

unicode-math does almost all its definitions \AtBeginDocument (there are some issues open about that) but that means that any redefinitions also need to be delayed to that point either by putting them in the same hook, or putting them after \begin{document}

[davidcarlisle]

This is essentially a duplicate of #477

[jebej]

Thanks, I hadn't seen that issue. Is there any way of making the physics package work correctly then or must we use the manual solution here?

[ArchangeGabriel]

You must use the workaround (or make physics use it, but actually you should rather ditch the physics package —see https://tex.stackexchange.com/q/471532/56823, https://tex.stackexchange.com/q/471563/56823).

[davidcarlisle]

physics package has other issues I think... but

\documentclass{article}
\usepackage{unicode-math}
\AtBeginDocument{\usepackage{physics}}
\begin{document}

$\Re$
\end{document}

if you must

[jebej]

Thank you! I'll close this in favor of #477.