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book/syntax_exercises/009.md
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In this exercise, you will learn how to create references to other parts of your book, such as chapters, sections, equations, tables, figures, and links.
# Exercise 9: Cross-referencing content
In this exercise, you will learn how to create references to other parts of your book, such as chapters, sections, equations, tables and figures, as well as links.
::::::{topic} Exercise objective
Can you create internal references to other sections, equations, tables, figures, and links?
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## 2. Referencing an Equation
To reference an equation, you need to define a label using `{eq}` and refer to it elsewhere in your text:
To reference an equation, you need to define a label when creating the equation and refer to it elsewhere in your text using `{eq}`:
```md
```{math}
:label: eq-example
E = mc^2
```
```{math}
:label: eq-example
E = mc^2
```
```
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```
```
And refer to it using:
And refer to it using `{numref}`:
```md
Table {numref}`tab-example`
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```
```
And refer to it using:
And refer to it using `{numref}`:
```md
Figure {numref}`fig-example`