Commit 2019-11-20 20:03 9d031be0
View on Github →feat(group_theory/congruence): quotients of monoids by congruence relations (#1710)
- add congruence.lean
- add has_mul
- add definition of congruence relation
- minor changes
- Tidy up second half of congruence.lean
- tidying docstrings
- tidying
- constructive 3rd isom in setoid used in congruence
- remove import
- open namespaces earlier
- responding to PR comments