# `Feel.Analysis.Images.Boolean`
[🔗](https://github.com/FeeJai/BDM/blob/feel-v0.1.0/apps/feel/lib/feel/analysis/images/boolean.ex#L1)

The rules for the boolean built-ins (`Feel.Analysis.Images`, D-161): `not`.

`not(b)` is the other boolean for a boolean, and `null` with an error for an argument of any other kind (a type mismatch,
like the operators'), and for `null`. So `not(b)` for `b` that is `true` is `false` and nothing else, and it is never `null`
for a boolean.

---

*Consult [api-reference.md](api-reference.md) for complete listing*