Abstract
For a \(\mathcal {C}^2\)-smooth function on a finite-dimensional space, a necessary condition for its quasiconvexity is the positive semidefiniteness of its Hessian matrix on the subspace orthogonal to its gradient, whereas a sufficient condition for its strict pseudoconvexity is the positive definiteness of its Hessian matrix on the subspace orthogonal to its gradient. Our aim in this paper is to extend those conditions for \(\mathcal {C}^{1,1}\)-smooth functions by using the Fréchet and Mordukhovich second-order subdifferentials.
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Acknowledgements
The authors are grateful to the editors and two anonymous referees for constructive comments and suggestions, which greatly improved the paper. Pham Duy Khanh was supported, in part, by the Fondecyt Postdoc Project 3180080, the Basal Program CMM–AFB 170001 from CONICYT–Chile, and the National Foundation for Science and Technology Development (NAFOSTED) under Grant Number 101.01-2017.325.
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Khanh, P.D., Phat, V.T. Second-order characterizations of quasiconvexity and pseudoconvexity for differentiable functions with Lipschitzian derivatives. Optim Lett 14, 2413–2427 (2020). https://doi.org/10.1007/s11590-020-01563-6
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DOI: https://doi.org/10.1007/s11590-020-01563-6