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I want to use the \lBrace/\rBrace symbols from stix without changing all other math symbols in my document. A helpful snippet is provided here, which I have successfully used in the past with, I think, xelatex. However, I am now using the kao template. Kao uses the unicode-math package, which breaks the trick to import from stix:

\documentclass{article}
\usepackage{unicode-math}

\makeatletter
\@ifpackageloaded{stix}{%
}{%
  \DeclareFontEncoding{LS2}{}{\noaccents@}
  \DeclareFontSubstitution{LS2}{stix}{m}{n}
  \DeclareSymbolFont{stix@largesymbols}{LS2}{stixex}{m}{n}
  \SetSymbolFont{stix@largesymbols}{bold}{LS2}{stixex}{b}{n}
  \DeclareMathDelimiter{\lBrace}{\mathopen} {stix@largesymbols}{"E8}%
                                            {stix@largesymbols}{"0E}
  \DeclareMathDelimiter{\rBrace}{\mathclose}{stix@largesymbols}{"E9}%
                                            {stix@largesymbols}{"0F}
}
\makeatother

\begin{document}
$\lBrace A, B, C\rBrace$
\end{document}

Output after latexmk -lualatex test:

A, B, C without curly braces

If remove the unicode-math import, and compile with latexmk -pdf test, I get the following:

enter image description here

This is what I would like to achieve in lualatex combined with unicode-math. Any ideas? Lualatex version is 1.10.0. My tex distribution is "TeX Live 2019/Debian" (on Linux Mint 20.03. Yes, I need to upgrade but can't find the time...).

I have tried using stix2 (Stix Two?) but that has the same effect (= symbols missing in the final pdf). I guess I could also try to remove the dependency on unicode-math, but I'm assuming this dependency is there for a reason... I'd also be happy with a solution that doesn't involve stix; I just need those two symbols as delimiters, but I don't care much for how they look. If there's another package that provides these symbols I'd happily use it instead, but I've not been able to find it...

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  • 2
    don't use the stix package or 8-bit LS1 and LS2 encoding, just load the stix mat font and use unicode-math range option to specify which characters should use that. Commented May 22, 2025 at 11:55

2 Answers 2

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It seem lBrace and rBrace are already defined. By using a different name you get the output you're looking for.

\documentclass{article}

\usepackage{unicode-math}

\makeatletter
\@ifpackageloaded{stix}{%
}{%
  \DeclareFontEncoding{LS2}{}{\noaccents@}
  \DeclareFontSubstitution{LS2}{stix}{m}{n}
  \DeclareSymbolFont{stix@largesymbols}{LS2}{stixex}{m}{n}
  \SetSymbolFont{stix@largesymbols}{bold}{LS2}{stixex}{b}{n}
  \DeclareMathDelimiter{\mylBrace}{\mathopen} {stix@largesymbols}{"E8}{stix@largesymbols}{"0E}
  \DeclareMathDelimiter{\myrBrace}{\mathclose}{stix@largesymbols}{"E9}{stix@largesymbols}{"0F}
}

\makeatother

\begin{document}

$\mylBrace A, B, C\myrBrace$

\end{document}
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  • Nice catch! It looks like pdflatex and xelatex/lualatex have different behaviour w.r.t. reusing names as arguments to \DeclareMathDelimiter, weird. Commented May 22, 2025 at 12:20
1

Based on @david-carlisle's comment, the following also works:

\documentclass{article}

\usepackage{unicode-math}

\AtBeginDocument{
  \setmathfont{STIX}[range={\lBrace, \rBrace}]
}

\begin{document}
$\lBrace A, B, C\rBrace$
\end{document}
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