“…Motivated by various concepts of convexity, Liang et al [5] have put forward a generalized convexity, which was called ( , , , )-convex, which extended ( , )-convex, and Liang et al [6], Weir and Mond [7], Weir [8], Jeyakumar and Mond [9], Egudo [10], Preda [2], and Gulati and Islam [3] obtained some corresponding optimality conditions and applied these optimality conditions to define dual problems and derived duality theorems for single objective fractional problems and multiobjective problems. Then the definition of generalized ( , , , )-convex is given under the condition of ( , , , )-convex.…”