| Symbol | Specification | Kind | Type |
|---|---|---|---|
| # . | natset | f | Natset → Nat |
| . + . | nat-basic | f | Nat × Nat → Nat |
| . ++ . | natset | f | Natset × Nat → Natset |
| . +1 | nat-basic | f | Nat → Nat |
| . - . | nat | pf | Nat × Nat → Nat with λ n, m. n ≥ m |
| . -- . | natset | f | Natset × Nat → Natset |
| . -1 | nat-basic | pf | Nat → Nat with λ n. n ≠ 0 |
| . < . | nat-basic | p | Nat × Nat |
| . > . | nat | p | Nat × Nat |
| . \ . | natset | f | Natset × Natset → Natset |
| . ∈ . | natset | p | Nat × Natset |
| . ∩ . | natset | f | Natset × Natset → Natset |
| . ∪ . | natset | f | Natset × Natset → Natset |
| . ≤ . | nat | p | Nat × Nat |
| . ≥ . | nat | p | Nat × Nat |
| . ⊆ . | natset | p | Natset × Natset |
| . to . | natset | f | Nat × Nat → Natset |
| { . } | natset | f | Nat → Natset |
| ∅ | natset | c | Natset |
| Nat | nat-basic | s | |
| Natset | natset | s | |
| disjoint | natset | p | Natset × Natset |
| m | natset | v | Nat |
| n | natset | v | Nat |
| ns | natset | v | Natset |