> 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-tw/latex-cuo-wu/29-there-were-multiply-defined-labels.md).

# 有多個定義的標籤

此錯誤與交叉參照有關。當你將相同的標籤多次用於不同物件時，就會出現，導致 LaTeX 在 **`\ref{...}`** 被使用時。

## 常見原因

**相同標籤被多次使用：**

這類錯誤最基本的例子，就是將相同的標籤直接給予不同的物件，如下所示

```latex
\section{Section 1}
\label{algebra}

\includegraphics{image.jpg}
\label{algebra}
```

在這裡，圖片（image.jpg）和章節（Section 1）都被標記為 *algebra*，這會讓 LaTeX 在參照 **`\ref{algebra}` 被使用時。** 時無法判斷應該參照哪一個，如下所示

main.tex

存在多個重複定義的標籤。

若要解決此問題，請將其中一個標籤重新命名為其他名稱。


---

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