... local minimum of Φ in H with c1:Φv20 >c0.At this point, we can apply Lemma 2.5 taking Ψ and −Ψ as perturbing terms. Then, for ∈ 0,rδ small enough and any ρ1∈ c0, min {b, ... equation in brain modelling,” Bulletin of the Institute of Mathematics and ItsApplications, vol. 12, no. 7, pp. 207–214, 1976.3 A. N. Njah and U. E. Vincent, “Chaos synchronization between single ... Bu1,.3. Main Results In this section, we will prove that problems 1.1-1.2 have three distinct solutions by usingthe variational principle of Ricceri and a local mountain pass lemma.Hindawi...