%0 Journal Article %T Optimality conditions for approximate solutions of vector optimization problems with variable ordering structures %J Bulletin of the Iranian Mathematical Society %I Iranian Mathematical Society (IMS) %Z 1017-060X %A ‎Soleimani, B. %A Tammer, C. %D 2016 %\ 12/18/2016 %V 42 %N Issue 7 (Special Issue) %P 5-23 %! Optimality conditions for approximate solutions of vector optimization problems with variable ordering structures %K Nonconvex vector optimization‎ %K ‎variable ordering structure‎ %K ‎Ekeland's variational principle‎ %K ‎optimality conditions‎ %R %X ‎We consider nonconvex vector optimization problems with variable ordering structures in Banach spaces‎. ‎Under certain boundedness and continuity properties we present necessary conditions for approximate solutions of these problems‎. ‎Using a generic approach to subdifferentials we derive necessary conditions for approximate minimizers and approximately minimal solutions of vector optimization problems with variable ordering structures applying nonlinear separating functionals and Ekeland's variational principle‎.  %U http://bims.iranjournals.ir/article_885_c784a05612ed4dd1924879eb1e344219.pdf