3

I was using the \DeclareMathOperator* in amsmath to define some \mathop. The Following Example worked without ctex package.

\documentclass{article}
\usepackage{amsmath}
\DeclareMathOperator*{\hugeX}{X}
\DeclareMathOperator*{\hugepi}{\pi}
\DeclareMathOperator*{\hugeLambda}{\Lambda}
\begin{document}
    \[  
        \hugeX_{n=1}^\infty + \hugepi_{n=1}^{\infty} + \hugeLambda_{n=1}^{\infty} + X + \lambda + \Lambda 
    \] 
\end{document}

However, if the ctex package is loaded, the math alphabet \Lambda is missing! And it yields the below:

with ctex package

Inspiring by the brilliant solution here, I can change the \operator@font, and it worked:

\documentclass{article}
\usepackage{ctex}
\usepackage{amsmath}
\DeclareMathOperator*{\hugeX}{X}
\DeclareMathOperator*{\hugepi}{\pi}
\DeclareMathOperator*{\hugeLambda}{\Lambda}
\DeclareFontShape{OMX}{cmex}{m}{n}{%
  <-7.5>cmex7%
  <7.5-8.5>cmex8%
  <8.5-9.5>cmex9%
  <9.5->cmex10%
}{}
\DeclareSymbolFont{MyOperatorFont}{OT1}{cmr}{m}{n}
\makeatletter
\def\operator@font{\mathgroup\symMyOperatorFont}
\makeatother
\begin{document}
    \[  
        \hugeX_{n=1}^\infty + \hugepi_{n=1}^{\infty} + \hugeLambda_{n=1}^{\infty} + X + \lambda + \Lambda 
    \] 
\end{document}

However, I noticed that unicode-math has the usage of defining a new \mathfontface, but I don't know how to assign the cmm as the default, the \mathrm seemed to be failed as below but \mathscr is not the default roman style:

\documentclass{article}
\usepackage{ctex}
\usepackage{amsmath}
\DeclareMathOperator*{\hugeX}{X}
\DeclareMathOperator*{\hugepi}{\pi}
\DeclareMathOperator*{\hugeLambda}{\Lambda}
\usepackage{unicode-math}
\setoperatorfont\mathcal % I don't know how to set is to be default cmr here...
\begin{document}
    \[  
        \hugeX_{n=1}^\infty + \hugepi_{n=1}^{\infty} + \hugeLambda_{n=1}^{\infty} + X + \lambda + \Lambda 
    \] 
\end{document}

In a word, My Question is that:

  • What ctex package's behavior to change the \operator@font?
  • Why in the above MWE, the \pi keep the same, but the \Lambda missing?
  • Is there easier method to fixed the ctex's side-effect via unicode-math?
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1 Answer 1

Reset to default
4

Just use \mathnormal for the Greek letters.

\documentclass{article}
\usepackage[fontset=fandol]{ctex}
\usepackage{amsmath}
\usepackage{unicode-math}

\DeclareMathOperator*{\hugeX}{X}
\DeclareMathOperator*{\hugepi}{\mathnormal{\pi}}
\DeclareMathOperator*{\hugeLambda}{\mathnormal{\Lambda}}

\begin{document}

\[  
  \hugeX_{n=1}^\infty +
  \hugepi_{n=1}^{\infty} +
  \hugeLambda_{n=1}^{\infty} +
  X + \lambda + \Lambda 
\] 

\end{document}

(I had to add fontset=fandol, because CTeX refuses to work otherwise.)

output

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2
  • Could you please also tell me the reason of that, why the \mathnormal happened to fix the case? Or it think I need some introcudtion about the mathfonts. Commented Jan 18, 2025 at 12:18
  • 2
    @Explorer ctex has no role here. The text font, used by \operator@font doesn't support math characters, so with \mathnormal we switch to the math font. That's all. Commented Jan 18, 2025 at 13:01

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