| 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 |
| . .ec | echeader | f | echeader → nat |
| . .ec:= . | echeader | f | echeader × nat → echeader |
| . < . | nat-basic | p | nat × nat |
| . > . | nat | p | nat × nat |
| . ≤ . | nat | p | nat × nat |
| . ≥ . | nat | p | nat × nat |
| echdr | echeader | f | nat → echeader |
| echeader | echeader | s | |
| ehdr | echeader | v | echeader |
| m | nat-basic | v | nat |
| m0 | echeader | v | nat |
| n | nat-basic | v | nat |
| n0 | nat-basic | v | nat |
| n1 | nat-basic | v | nat |
| nat | nat-basic | s |