## Example

To see all the facts involving the `le`

relation from the prelude:

```
Coq < Search le.
le_n: forall n : nat, n <= n
le_S: forall n m : nat, n <= m -> n <= S m
...
max_l: forall n m : nat, m <= n -> Nat.max n m = n
max_r: forall n m : nat, n <= m -> Nat.max n m = m
...
```

To search about all the facts involving the notation `<`

:

```
Coq < Search "<".
exists_lt: forall (Q : nat -> Prop) (k l : nat), exists_between Q k l -> k < l
in_int_intro: forall p q r : nat, p <= r -> r < q -> in_int p q r
in_int_lt: forall p q r : nat, in_int p q r -> p < q
...
```