proposition: Lemma eq_tele_sym_equiv@{i} {Δ : Tel@{i}} {x y : Δ} : x == y <~> y == x.
proof: Proof. refine (equiv_compose _ _). refine (equiv_sym _). refine (eq_points_equiv _ _ _). refine (equiv_compose _ _). refine eq_sym_equiv. refine (eq_points_equiv _ _ _). Defined.
imports: Equations Utf8 DepElimDec EqDecInstances