`\\` line separators invalid in matrix environments

[Dewedseed]

Hello. I got a issue when using some matrix environment (matrix pmatrix bmatrix vmatrix etc.) The \\ line separators seems to be invalid.

For example:

$$\begin{pmatrix}
   a & b & c \\
   c & d & e \\
\end{pmatrix}$$

Rendering result: (a b c c d e)

And \cr does work but i have to make a lot of modifications. Is there any way to solve this problem? I will be grateful for your reply.

[SichangHe]

What I get:

Could you provide OS, versions, how you got mdBook-KaTeX?

[Dewedseed]

I used the Windows OS and got it from Github. Here is the version information:

• mdBook (mdbook-v0.4.36-x86_64-pc-windows-msvc.zip) https://github.com/rust-lang/mdBook/releases
• mdBook-KaTeX (mdbook-katex-v0.5.9-x86_64-pc-windows-msvc.zip) https://github.com/lzanini/mdbook-katex/releases/tag/v0.5.9

I added the path of .exe files to the environment variable and then created a simplest book by commands mdbook init and mdbook serve --open.

• book.toml

[book]
authors = []
language = "en"
multilingual = false
src = "src"
title = "testbook"

[output.html]
mathjax-support = true

[preprocessor.katex]
after = ["links"]

• chapter_1.md

# Chapter 1

$$\begin{pmatrix}
   a & b & c \\
   c & d & e \\
\end{pmatrix}$$

What I get in Microsoft Edge:

It also doesn't work when copying the .exe files to the path. Is there anything wrong with my computer :sob:

[SichangHe]

Could you please read this: https://github.com/lzanini/mdbook-katex?tab=readme-ov-file#windows-users

[Dewedseed]

Oh, I didn't notice this and made the mistake. I used to think that mdbook-katex needed to use the same version as mdbook.
Thank you very much! 💓

[SichangHe]

Ah, no, the problem is that you should use the GNU build.

[Dewedseed]

Yes, it does work normally now. Thank you again for your help.

[SichangHe]

You're welcome.