⟨⟩
  Assumed: a
  Assumed: b
a ∧ b
  Set option: lean::pp::notation
⟨lean::pp::notation ↦ false⟩
and a b
Variable a : Bool
Variable b : Bool
  Set option: lean::pp::notation
⟨lean::pp::notation ↦ true⟩
a ∧ b