Commit 2021-12-21 23:32 fc66d88c
View on Github →refactor(ring_theory/derivation): use weaker TC assumptions (#10952)
Don't assume [add_cancel_comm_monoid M], add map_one_eq_zero as an axiom instead. Add a constructor derivation.mk' that deduces map_one_eq_zero from leibniz.
Also generalize smul/module instances.