> For the complete documentation index, see [llms.txt](https://ayakaleaf-pro.ayaka.space/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ayakaleaf-pro.ayaka.space/latex/zh-cn/latex-cuo-wu/11-latex-error-mathrm-allowed-only-in-math-mode.md).

# LaTeX 错误：\mathrm 只允许在数学模式中使用

当我们在文本模式中使用一种只允许在数学模式中使用的字体时，就会出现此错误。使用此类字体时，请确保将它们放在美元符号中，如 `$...$`。要了解更多关于数学字体的信息，请随时查看我们的 [文档](/latex/zh-cn/shu-xue/12-mathematical-fonts.md)。下面显示了这些字体及其对应宏包的列表

|                  |                                                                                                                                                                        |
| ---------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| \mathnormal{...} | 这是数学斜体字体中的标准斜体字体。 `$\mathnormal{Hello world}$` 将得到与 `$Hello world$`.                                                                                                   |
| \mathrm{...}     | 这是标准的文本罗马字体。                                                                                                                                                           |
| \mathbf{...}     | 这会在数学模式下生成粗体字母。                                                                                                                                                        |
| \mathcal{...}    | 这是数学模式下的一种特殊书法字体。它只能用于大写字母，例如用于表示实数。 `\mathcal{R}` 将得到 ℝ。                                                                                                              |
| \mathsf{...}     | 这会在数学模式下生成无衬线字母。                                                                                                                                                       |
| \mathit{...}     | 这会生成文本斜体字母。根据所使用的具体类，它们可能与数学斜体字母不同。                                                                                                                                    |
| \mathtt{...}     | 这会生成打字机字体中的直立字母。                                                                                                                                                       |
| \mathbb{...}     | 这为大写字母提供一种“黑板粗体”字体。该 [**`amsfonts`**](https://www.ctan.org/pkg/amsfonts?lang=en) 宏包，或者等价地 该 [**`amssymb`**](https://www.ctan.org/pkg/amssymb?lang=en) 宏包必须加载，才能使用这种字体。 |
| \mathfrak{...}   | 这提供大小写形式的哥特字母。该 [**`amsfonts`**](https://www.ctan.org/pkg/amsfonts?lang=en) 宏包，或者等价地 该 [**`amssymb`**](https://www.ctan.org/pkg/amssymb?lang=en) 宏包必须加载，才能使用这种字体。      |
| euscript         | 该 [**`euscript`**](http://tug.ctan.org/fonts/amsfonts/doc/euscript.pdf) 宏包为我们提供了另一种称为 Euler script 的书法字母表。                                                             |

**上述数学字体的文本模式等价字体：**

| 数学模式字体           | 文本等价字体        |
| ---------------- | ------------- |
| \mathnormal{...} | \textit{...}. |
| \mathrm{...}     | \text{...}    |
| \mathbf{...}     | \textbf{...}. |
| \mathcal{...}    | 没有对应的文本模式字体。  |
| \mathsf{...}     | \textsf{...}. |


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