On Properties of Geodesic Semilocal E-Preinvex Functions

The authors define a class of functions on Riemannian manifolds, which is called geodesic semilocal E-preinvex functions, as a generalization of geodesic semilocal E-convex and geodesic semi E-preinvex functions and some of its properties are established. Furthermore, a nonlinear fractional multiobjective programming is considered, where the functions involved are geodesic E-$\eta$-semidifferentiability, sufficient optimality conditions are obtained. A dual is formulated and duality results are proved using concepts of geodesic semilocal E-preinvex functions, geodesic pseudo-semilocal E-prinvex functions and geodesic quasi-semilocal E-preinvex functions.