Booleans and set operations

This file contains three trivial lemmas about Bool, Set.univ, and Set.range.

@[simp]

theorem Bool.univ_eq : Set.univ = {false, true}

@[simp]

theorem Bool.range_eq {α : Type u_1} (f : Bool → α) : Set.range f = {f false, f true}

@[simp]

theorem Bool.compl_singleton (b : Bool) : {b}ᶜ = {!b}