# LibTmux.Query.not_

- **Package:** libtmux-haskell
- **Language:** Haskell
- **Kind:** function
- **Source:** https://github.com/libtmux/libtmux-haskell/blob/663e212622a02aa74a9bdc8ff71e2b45fcb1d4d5/internal/LibTmux/Internal/Query.hs#L196
- **Page:** https://libtmux.org/en/haskell/latest/reference/libtmux-query-v-not_/

```haskell
not_ :: Expr row -> Expr row
```

Signature types: [`Expr`](/en/haskell/latest/reference/libtmux-query-t-expr/).

Logical negation, preserving the expression's validation requirements.

## Referenced declarations

- [`LibTmux.Query.Expr`](/en/haskell/latest/reference/libtmux-query-t-expr/) (data type)