This commit also replaces the notation for divides
`(` a `|` b `)`
with
a `∣` b
The character `∣` is entered by typing \|
closes #516
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| .. | ||
| category | ||
| precategory | ||
| algebra.md | ||
| binary.hlean | ||
| group.hlean | ||
| groupoid.hlean | ||
| relation.hlean | ||