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Journal of Convex Analysis 19 (2012), No. 1, 091--111
Copyright Heldermann Verlag 2012



A Note on Extended Characterization of Generalized Trade-Off Directions in Multiobjective Optimization

Marko M. Mkel
Dept. of Mathematics, University of Turku, 20014 Turku, Finland
makela@utu.fi

Yury Nikulin
Dept. of Mathematics, University of Turku, 20014 Turku, Finland
yurnik@utu.fi

Jzsef Mezei
Dept. of Information Technologies, Abo Akademi University, 20520 Turku, Finland
jmezei@abo.fi



We consider five basic optimality principles for a general multiobjective optimization problem with convex and nonconvex partial objectives. We introduce a generalization of the concept of trade-off directions defining them via some optimal surface of appropriate cones. In both cases, we link optimality and generalized trade-off directions by deriving geometrical optimality conditions in terms of appropriate cones. We scrutinize similarities and differences between the cases. Combining newly proven facts with some previously known results, we derive four general patterns reflecting structural properties and interconnections of the considered optimality principles. Additionally, we provide extended characterization of optimality for some peculiar cases.

Keywords: Multiobjective optimization, optimality principles, generalized trade-offs, tangent cones, normal cones, contingent cones, convex and nonconvex optimization.

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