```json
{
"title": "Type Theory Reference",
"author": "",
"site": "",
"published": ""
}
```
This page defines helper functions for working with natural numbers. The code blocks below use span elements with generated anchor IDs that happen to match partial selector patterns like "next-".
```lean
def h1 (x : Nat) : Nat :=
```
The function h1 takes a natural number and returns a natural number. Below is a second definition that should also be preserved.
```lean
def h2 (x : Nat) : Nat :=
```
Both h1 and h2 should appear in the output. If partial selector removal strips the span elements inside code, the function names will be missing.