| Symbol | Specification | Kind | Type |
|---|---|---|---|
| . + . | nat-basic | f | Nat × Nat → Nat |
| . ++ . | infset-basic | f | Iset('a) × 'a → Iset('a) |
| . +1 | nat-basic | f | Nat → Nat |
| . - . | nat | pf | Nat × Nat → Nat with λ n, m. n ≥ m |
| . -- . | infset-union | f | Iset('a) × 'a → Iset('a) |
| . -1 | nat-basic | pf | Nat → Nat with λ n. n ≠ 0 |
| . < . | nat-basic | p | Nat × Nat |
| . > . | nat | p | Nat × Nat |
| . \ . | infset-union | f | Iset('a) × Iset('a) → Iset('a) |
| . ∈ . | infset-basic | p | 'a × Iset('a) |
| . ∩ . | infset-union | f | Iset('a) × Iset('a) → Iset('a) |
| . ∪ . | infset-union | f | Iset('a) × Iset('a) → Iset('a) |
| . ≤ . | nat | p | Nat × Nat |
| . ≥ . | nat | p | Nat × Nat |
| . ⊆ . | infset-basic | p | Iset('a) × Iset('a) |
| { . } | infset-basic | f | ('a → Bool) → Iset('a) |
| { . } | infset-union | f | 'a → Iset('a) |
| χ | infset-basic | f | Iset('a) → 'a → Bool |
| ∅ | infset-basic | c | Iset('a) |
| Iset | infset-basic | s | |
| Nat | nat-basic | s | |
| a | infset-union | v | 'a |
| b | infset-union | v | 'a |
| c | infset-union | v | 'a |
| s | infset-union | v | Iset('a) |