Commit 2022-12-23 16:03 d90ae095
View on Github →chore: move basic lemmas to basic files (#1109)
synchronize with https://github.com/leanprover-community/mathlib/pull/17882
Make
Removing disjoint_singleton @[simp 1100] because the linter complains it is not in simpNF (because of disjoint_singleton_left and disjoint_singleton_right).simp of disjoint_singleton, making disjoint_singleton_left have a greater priority than disjoint_singleton_right, then disjoint_singleton can be proved by simp.