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I'm using musixtex in xelatex, and there's a problem: command \breve is defined in musixtex and in "math mode" (is it a package "amsmath"?).
So, I have a warning due compilation:
LaTeX Error: Command `\breve' already defined.
There is no \usepackage{amsmath} or \usepackage{amssymb} in document, but xelatex loads it himself (line from log):
(/usr/share/texlive/texmf-dist/tex/latex/amsmath/amsmath.sty
How can I disable loading math packages or "math-mode"?
The amsmath package is not loaded by default, but it's not the problem. You can just load fontspec with the no-math option:
\documentclass{article}
%\usepackage{amsmath} % optional
\usepackage[no-math]{fontspec}
\usepackage{musixtex}
\begin{document}
No error about \breve is raised with or without amsmath and the definition of \breve in the document is the one by musixtex.
\documentclass{...}and ending with\end{document}.\breveis a math accent which is include in plain LaTeX, as well as in plain TeX. You can only disable it by rebuildung the format without it. Or you could just\let\breve=\relaxbefore loadingmusixtex.\brevebut you are not correct that xetex automatically loads amsmath. You have not shown any information to guess what is loading it but either the class file or one of your othe packages. (the log would show, by matching the(and)around file names.\breveis "build-in" LaTeX command, amsmath doesn't matter. But it means, that musiaxtex developers are using a command, that's already used in base LaTeX, isn't it? So, I will always receive a message about "Command \breve already defined", becouse I can't disable\brevein base-latex, right?