| Symbol | Specification | Kind | Type |
|---|---|---|---|
| . + . | nat-basic | f | nat × nat → nat |
| . ++ . | infset-basic | f | set × elem → set |
| . +1 | nat-basic | f | nat → nat |
| . - . | nat | pf | nat × nat → nat with λ n, m. n ≥ m |
| . -1 | nat-basic | pf | nat → nat with λ n. n ≠ 0 |
| . < . | nat-basic | p | nat × nat |
| . > . | nat | p | nat × nat |
| . ∈ . | infset-basic | p | elem × set |
| . ≤ . | nat | p | nat × nat |
| . ≥ . | nat | p | nat × nat |
| . ⊆ . | infset-basic | p | set × set |
| { . } | infset-basic | f | (elem → bool) → set |
| χ | infset-basic | f | set → elem → bool |
| ∅ | infset-basic | c | set |
| a | infset-basic | v | elem |
| b | infset-basic | v | elem |
| elem | elem | s | |
| f | infset-basic | v | elem → bool |
| nat | nat-basic | s | |
| s | infset-basic | v | set |
| set | infset-basic | s |