Proofgold Proof

pf
Let x0 of type ι be given. Assume H0: x0 ∈ int. Apply minus_SNo_minus_CSNo with x0, λ x1 x2 . x1 ∈ int leaving 2 subgoals. Apply int_SNo with x0. The subproof is completed by applying H0. Apply int_minus_SNo with x0. The subproof is completed by applying H0. ■