| Symbol | Specification | Kind | Type |
|---|---|---|---|
| . + . | nat-basic | f | nat × nat → nat |
| . +1 | nat-basic | f | nat → nat |
| . -1 | nat-basic | pf | nat → nat with λ n. n ≠ 0 |
| . < . | nat-basic | p | nat × nat |
| . ≪ . | wellfounded | p | elem × elem |
| A | wellfounded-TL | v | elem,flexible |
| N | wellfounded-TL | v | nat,flexible |
| a | wellfounded-TL | v | elem |
| elem | wellfounded | s | |
| nat | nat-basic | s |