In order to make sure the *difference* between two numbers is positive, we use `abs`

on their subtraction.

Is there an equivalent function that makes sure the *ratio* between two numbers is (say) larger than one?

I know I can:

```
fun(Φ) = Φ < 1 ? 1/Φ : Φ
```

But the same can be argued for `abs`

:

```
abs(Δ) = Δ < 0 ? -Δ : Δ
```

I’m just wondering if I missed something.