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Since I have to export some CJK characters in LaTeX, I have the following two lines in an .org file :

#+LATEX_HEADER: \usepackage[BoldFont,SlantFont]{xeCJK}
#+LATEX_HEADER: \setCJKmainfont{HanaMinA}

However, this causes a weird display when I use org-toggle-latex-fragment.

example

You can see that the font name is displayed above each maths expression.

MWE

You must install HanaMinA fonts before testing. In Ubuntu:

sudo apt install fonts-hanazono

Here is the minimal not working example I gave above:

#+LATEX_HEADER: \usepackage[BoldFont,SlantFont]{xeCJK}
#+LATEX_HEADER: \setCJKmainfont{HanaMinA}

The Euclid–Euler theorem is a theorem in mathematics that relates perfect
numbers to Mersenne primes. It states that every even perfect number has the
form $2^{p - 1}(2^p - 1)$, where $2^p - 1$ is a prime number. The theorem is named after
Euclid and Leonhard Euler. 

How this problem can be solved?

UPDATE

I found a hint while I'm reading one answer about "How to make a new tex command in org-mode-latex?". In short, everything involved with #+LATEX_HEADER: is taken account by the preview. Therefore, the question turns out to be how can I use packages for export only and not for preview? I have tried to move the two lines to an export latex block, but it doesn't work.

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