proposition: Theorem oppℝ_Eeq_involutive_realizer : forall e, oppℝ_Eeq_involutive↓e ⊩ ∀x, (--x ≡≡ x)%Re.
proof: Proof. unfold Eeq, oppℝ. Ksolve; rewrite Qcopp_involutive; Ksolve. Qed.
imports: QArith Psatz ClassicalRealizability.Kbase ClassicalRealizability.Rationals ClassicalRealizability.Real_definitions ClassicalRealizability.Real_relations