> For the complete documentation index, see [llms.txt](https://overleaf-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://overleaf-pro.ayaka.space/latex/zh-cn/latex-cuo-wu/11-latex-error-mathrm-allowed-only-in-math-mode.md).

# LaTeX 错误：\mathrm 仅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，会出现此错误。使用此类字体时，请确保将它们包含在美元符号中，例如 `$...$`。想了解更多关于数学字体的信息，欢迎查看我们的 [文档](/latex/zh-cn/shu-xue/12-mathematical-fonts.md)。下面列出了这类字体及其对应的宏包

|                  |                                                                                                                                                                     |
| ---------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| \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{...}     | 这会在数学模式下显示粗体字母。                                                                                                                                                     |
| \mathcal{...}    | 这是数学模式中的一种特殊书法字体。它只能用于大写字母，例如用于表示实数集。 `\mathcal{R}` 将得到 ℝ。                                                                                                          |
| \mathsf{...}     | 这会在数学模式下显示无衬线字母。                                                                                                                                                    |
| \mathit{...}     | 这会显示文本斜体字母。根据所使用的具体类，这些字母可能与数学斜体字母不同。                                                                                                                               |
| \mathtt{...}     | 这会显示所用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。 [**`amsfonts`**](https://www.ctan.org/pkg/amsfonts?lang=en) 宏包，或者等效地， [**`amssymb`**](https://www.ctan.org/pkg/amssymb?lang=en) 宏包必须加载后才能使用此字体。 |
| \mathfrak{...}   | 这为大小写字母都提供哥特字体。 [**`amsfonts`**](https://www.ctan.org/pkg/amsfonts?lang=en) 宏包，或者等效地， [**`amssymb`**](https://www.ctan.org/pkg/amssymb?lang=en) 宏包必须加载后才能使用此字体。     |
| euscript         | 该 [**`euscript`**](http://tug.ctan.org/fonts/amsfonts/doc/euscript.pdf) 宏包为我们提供了另一种书法字母表，称为 Euler 脚本体。                                                              |

**以上数学字体的文本等价形式：**

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


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