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This error appears when you have accidentally forgotten a ** $** sign when exiting display math mode.

**Forgetting & sign:**

When writing in *inline math mode*, you must write your equation inside single dollar signs ** $...$**. When writing in

`$$...$$`

```
The equation we would like to write is
$$ E=mc^2 $
```

This will generate an error which looks like

main.tex, line 9

<inserted text> $ l.9 I've inserted a begin-math/end-math symbol since I think you left one out. Proceed, with fingers crossed.

To avoid this error, always make sure that your ** $**s balance around math, i.e. there is the same number of

`$`