import Int. variable P : Int -> Int -> Int -> Bool axiom Ax1 : exists x y z, P x y z axiom Ax2 : forall x y z, not (P x y z) theorem T : false := exists::elim Ax1 (fun a H1, exists::elim H1 (fun b H2, exists::elim H2 (fun (c : Int) (H3 : P a b c), let notH3 : not (P a b c) := forall::elim (forall::elim (forall::elim Ax2 a) b) c in absurd H3 notH3)))