mathlib

095445ee - refactor(order/*): make `data.set.basic` import `order.bounded_lattice` (#3285)

refactor(order/*): make `data.set.basic` import `order.bounded_lattice` (#3285) I have two goals: * make it possible to refactor `set` to use `lattice` operations; * make `submonoid.basic` independent of `data.nat.basic`.