Abstract
In this paper, a weak version of Hahn-Banach theorem is derived for convex relations in ordered linear spaces in which a separation theorem of convex sets in [11] is used. Then this result is applied to derive existence of weak Lagrange multiplier theorem for the following vector optimization problem: where F,H are convex relations from a linear space X to an ordered linear space Y.We also prove existence of weak subgradient for convex relations by using Hahn-Banach theorem. A partial extension of the subgradient formula in [2] to ordered space is obtained
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