... critical point theory,” Journal of Mathematical Analysis and Applications, vol. 326, no.1, pp. 511–520, 2007.9 M. Aprahamian, D. Souroujon, and S. Tersian, “Decreasing and fast solutions for a ... Problems,Birkh¨auser, Boston,Mass, USA, 1993.12 W. Takahashi, Nonlinear Functional Analysis, Yokohama Publishers, Yokohama, Japan, 2000.13 G. Cerami, “An existence criterion for the critical points on ... Journal of Mathematical Analysis and Applications, vol. 320, no. 2, pp. 649–661, 2006.7 L. Jiang and Z. Zhou, Existence of nontrivial solutions for discrete nonlinear two point boundaryvalue problems,”...