Proofgold Proof

pf
Let x0 of type ι be given. Assume H0: SNo x0. Apply exp_SNo_nat_2 with x0, λ x1 x2 . SNoLe 0 x2 leaving 2 subgoals. The subproof is completed by applying H0. Apply SNo_sqr_nonneg with x0. The subproof is completed by applying H0. ■