Proofgold Proof

pf
Let x0 of type ι be given. Assume H0: nat_p x0. Let x1 of type ι be given. Assume H1: x1 ∈ x0. Apply Subq_atleastp with x1, x0. Apply nat_trans with x0, x1 leaving 2 subgoals. The subproof is completed by applying H0. The subproof is completed by applying H1. ■