| Symbol | Specification | Kind | Type |
|---|---|---|---|
| . + . | nat-basic | f | nat × nat → nat |
| . +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 |
| . ≤ . | nat | p | nat × nat |
| . ≥ . | nat | p | nat × nat |
| elem | elem | s | |
| inv | rtc-rel | p | elem × (elem → bool) |
| nat | nat-basic | s | |
| p | elem-rel | p | elem × elem |
| p* | rtc-rel | p | elem × elem |
| p+ | rtc-rel | p | elem × elem |
| pelem | rtc-rel | v | elem → bool |
| rtc | rtc-rel | p | nat × elem × elem |