intros; unfold eqv; simpl; auto; reflexivity.
intros; unfold eqv; simpl; auto; reflexivity.
intros; unfold eqv; simpl; apply Judgments_Category_Commutative.
intros; unfold eqv; simpl; auto; reflexivity.
intros; unfold eqv; simpl; auto; reflexivity.
intros; unfold eqv; simpl; apply Judgments_Category_Commutative.