# Commit 2019-09-04 12:27 8cd16b97

View on Github →feat(category_theory/sums): sums (disjoint unions) of categories (#1357)

- feat(category_theory/sum): direct sums of categories
- minor
- tidying
- Fix white space, remove old comments
- rearranging, associator
- add TODO comment about unitors
- fix import
- create /basic.lean files