多行数学在Quarto中失败

Question

Quarto 1.2.269，Pandoc2.19.2，XeTeX 3.141592653-2.6-0.999994

index.qmd

---
title: "Why do I get a warning and failure to convert?"
---

This works:

$$
a = \pi r^2
$$

These do not:

$$
a_n = \begin{cases}
          3n + 1  & \text{ if } n \text{ is odd} \\
          n / 2 & \text{ otherwise}
      \end{cases}
$$

$$
1 + 2 = 3 \\
3 + 2 = 5
$$

_quarto.yml

project:
  type: book

book:
  title: "MRE"
  chapters:
    - index.qmd

format:
  epub:
    toc: true  # whatever

然后尝试渲染..。

$ quarto render

pandoc 
  to: epub
  output-file: MRE.epub
  toc: true
  number-sections: true
  default-image-extension: png
  
metadata
  crossref:
    chapters: true
  title: MRE
  
[WARNING] Could not convert TeX math 
      a_n = \begin{cases}
            3n + 1  & \text{ if } n \text{ is odd } \\
            n / 2 & \text{ otherwise }
        \end{cases}
  , rendering as TeX
[WARNING] Could not convert TeX math 
  1 + 2 = 3 \\
  3 + 2 = 5
  , rendering as TeX:
  1 + 2 = 3 \\
  ^
  unexpected control sequence \\
  expecting "%", "\\label", "\\tag", "\\nonumber" or whitespace
Output created: _book/MRE.epub

...and的结果如下所示：

​

​

我做错了什么？如何在Quarto中使用用例环境或多行数学？

注意:这适用于项目类型网站，但不适用于项目类型手册。

Answer 1

您可以尝试将其封装在LateX环境中，例如equation或align (在PDF和HTML中都可以使用)

\begin{equation*}
    a_n = \begin{cases}
              3n + 1  & \text{ if } n \text{ is odd} \\
              n / 2 & \text{ otherwise}
          \end{cases}
\end{equation*}

\begin{align*}
1 + 2 = 3 \\
3 + 2 = 5
\end{align*}

例如，这里作为HTML输出：

​

​