“…V , for all q ∈ M. This problem was studied in [6]. (ii) Given (e, z) ∈ E ×Z, if R(w, p, p) ≡ R(p), S (w, p, q) ≡ S (p, q), and Ψ(w, p) ≡ Ψ(p), f (w) ≡ f , then Problem 2.1 reduces to the following problem, which was considered in [20] for finding p * ∈ M(e) such that…”