Omirov, BakhromLadra González, Manuel EulogioTurdibaev, RustamUniversidade de Santiago de Compostela. Facultade de Matemáticas. Departamento de Álxebra2016-03-082016-03-082016-03-08http://hdl.handle.net/10347/13937In this thesis some tools to study cohomology groups of Leibniz algebras with values in itself are presented. Using Levi decomposition for semisimple Leibniz algebras we establish more precise decomposition of their cohomology groups. Close look to cohomologies in low degrees yields results on outer derivations of semisimple Leibniz algebra. Furthermore, an analogue of Jordan-Chevalley decomposition for Leibniz algebras is established. Moving to a more general object, Leibniz n-algebra a several notions of solvability and nilpotence are introduced and their invariance under derivations is established. The Frattini and Cartan subalgebras of Leibniz n-algebras are studied. Some classical results on these subalgebras are extended to Leibniz n-algebras, while some do not. In particular, examples showing that a statement on conjugacy of Cartan subalgebras of Lie algebras, which also holds in Leibniz and n-Lie algebras, does not hold for Leibniz n-algebras are constructed.engEsta obra atópase baixo unha licenza internacional Creative Commons BY-NC-ND 4.0. Calquera forma de reprodución, distribución, comunicación pública ou transformación desta obra non incluída na licenza Creative Commons BY-NC-ND 4.0 só pode ser realizada coa autorización expresa dos titulares, salvo excepción prevista pola lei. Pode acceder Vde. ao texto completo da licenza nesta ligazón: https://creativecommons.org/licenses/by-nc-nd/4.0/deed.glhttps://creativecommons.org/licenses/by-nc-nd/4.0/deed.glálgebras de Leibnizcohomología de Leibnizderivacionesn-álgebras de Leibnizsubálgebras de Cartan y FrattiniMaterias::Investigación::12 Matemáticas::1201 Algebra::120109 Algebra de LieMaterias::Investigación::12 Matemáticas::1201 Algebra::120112 Algebras no asociativasMaterias::Investigación::12 Matemáticas::1201 Algebra::120114 Teoría de la representacióndoctoral thesisopen access