%A QIAN Xin-qiang, WANG Kai-rong %T Optimality conditions on nonsmooth vector interval-valued optimization %0 Journal Article %D 2020 %J JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) %R 10.6040/j.issn.1671-9352.0.2019.141 %P 26-34 %V 55 %N 11 %U {http://lxbwk.njournal.sdu.edu.cn/CN/abstract/article_3359.shtml} %8 %X By using Clarke directional derivative and Clarke subdifferential, Fritz John optimal necessary conditions for weak LU efficient solutions of nonsmooth vector interval-valued optimization are obtained. Under the assumption of generalized invariant convexity and regularity of functions, KKT necessary optimality conditions, sufficient optimality conditions and related duality results are given. Some examples are used to verify the feasibility of the theory. These conclusions can solve the related problems of vector interval-valued optimization in general.