Proofgold Proof

pf
Let x0 of type ι be given. Assume H0: x0 ∈ complex. Let x1 of type ι be given. Assume H1: x1 ∈ complex. Apply HSNo_proj0_2 with x0, x1 leaving 2 subgoals. Apply complex_CSNo with x0. The subproof is completed by applying H0. Apply complex_CSNo with x1. The subproof is completed by applying H1. ■