multiobjective programming?

ýIn this articleý, ýwe formulate two dual models Wolfe and Mond-Weir related to symmetric nondifferentiable multiobjective programming problemsý. ýFurthermoreý, ýweaký, ýstrong and converse duality results are established under K-Gf-invexity assumptionsý. ýNontrivial examples have also been depicted to illustrate the theorems obtained in the paperý. ýResults established in this paper unify and extend some previously known results appeared in the literature