RT journal article T1 Necessary and Sufficient Second-Order Optimality Conditions on Hadamard Manifolds A1 Ruiz Garzón, Gabriel A1 Ruiz Zapatero, Jaime A1 Osuna Gómez, Rafaela A1 Rufián Lizana, Antonio A2 Estadística e Investigación Operativa K1 Hadamard manifold K1 second-order optimality conditions K1 generalized convexity AB This work is intended to lead a study of necessary and sufficient optimality conditions for scalar optimization problems on Hadamard manifolds. In the context of this geometry, we obtain and present new function types characterized by the property of having all their second-order stationary points be global minimums. In order to do so, we extend the concept convexity in Euclidean space to a more general notion of invexity on Hadamard manifolds. This is done employing notions of second-order directional derivatives, second-order pseudoinvexity functions, and the second-order Karush-Kuhn-Tucker-pseudoinvexity problem. Thus, we prove that every second-order stationary point is a global minimum if and only if the problem is either second-order pseudoinvex or second-order KKT-pseudoinvex depending on whether the problem regards unconstrained or constrained scalar optimization, respectively. This result has not been presented in the literature before. Finally, examples of these new characterizations are provided in the context of "Higgs Boson like" potentials, among others. PB MDPI SN 2227-7390 YR 2020 FD 2020-07 LK http://hdl.handle.net/10498/23597 UL http://hdl.handle.net/10498/23597 LA eng DS Repositorio Institucional de la Universidad de Cádiz RD 12-nov-2026