Abstract
In this paper, we first discuss the geometric properties of the Lorentz cone and the extended Lorentz cone. The self-duality and orthogonality of the Lorentz cone are obtained in Hilbert spaces. These properties are fundamental for the isotonicity of the metric projection with respect to the order, induced by the Lorentz cone. According to the Lorentz cone, the quasi-sublattice and the extended Lorentz cone are defined. We also obtain the representation of the metric projection onto cones in Hilbert quasi-lattices. As an application, solutions of the classic variational inequality problem and the complementarity problem are found by the Picard iteration corresponding to the composition of the isotone metric projection onto the defining closed and convex set and the difference in the identity mapping and the defining mapping. Our results generalize and improve various recent results obtained by many others.
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Acknowledgements
The authors would like to thank the referee for his/her very important comments that improved the results and the quality of the paper. The authors were supported financially by the National Natural Science Foundation of China (11371221, 11571296).
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Antonino Maugeri.
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Kong, D., Liu, L. & Wu, Y. Isotonicity of the Metric Projection by Lorentz Cone and Variational Inequalities. J Optim Theory Appl 173, 117–130 (2017). https://doi.org/10.1007/s10957-017-1084-5
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DOI: https://doi.org/10.1007/s10957-017-1084-5