Proposition. (
MetaCat_struct_b_product_exponent)
∃prod : set → set → set, ∃pi0 pi1 : set → set → set, ∃pair : set → set → set → set → set → set, ∃exp : set → set → set, ∃a : set → set → set, ∃lm : set → set → set → set → set, product_exponent_constr_p struct_b Hom_struct_b struct_id struct_comp prod pi0 pi1 pair exp a lm