In this paper, generalized connected functions with respect to cones such a
s quasi cone-connected, pseudo cone-connected, strongly pseudo cone-connect
ed, and strictly pseudo cone-connected functions are introduced; necessary
and sufficient optimality conditions are obtained for a weak minimum, a min
imum, and a strong minimum of a vector-valued minimization problem. A Mond-
Weir type dual is associated, and weak and strong duality results are estab
lished.