> For the complete documentation index, see [llms.txt](https://docs.atfinity.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.atfinity.io/rule-language/operators/boolean-operators/not.md).

# not

### Description

To negate any condition, use `not`.

### Example

```
p is Person
not p.domicile = ch
```

This simply gets you the opposite result from using `p.domicile = ch` . If the person in the [case](/guides/glossary/case.md) does not live in Switzerland, this condition evaluates as true.


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