Leibniz cohomology in low degreessome structure theory of Leibniz n-algebras

  1. Rustam Turdibaev
Supervised by:
  1. Bakhrom A. Omirov Director
  2. Manuel Ladra González Director

Defence university: Universidade de Santiago de Compostela

Year of defence: 2015

  1. Eduardo García Río Chair
  2. Ana Jeremías López Secretary
  3. José Manuel Casas Mirás Committee member
  4. Luisa María Camacho Santana Committee member
  5. Cristina Costoya Committee member
  1. Department of Mathematics

Type: Thesis


In 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.