2026-05-31T01:41:48Zhttps://riuma.uma.es/rest/oai/request

oai:riuma.uma.es:10630/134252026-02-03T12:13:21Zcom_10630_2254col_10630_37959

Draper-Fontanals, Cristina 2017-04-05T10:39:34Z 2017-04-05T10:39:34Z 2017-04-05 http://hdl.handle.net/10630/13425 http://orcid.org/0000-0002-2998-7473 These notes have been prepared for the Workshop on "(Non)-existence of complex structures on $\mathbb{S}^6$", to be celebrated in Marburg in March, 2017. The material is not intended to be original. It contains a survey about the smallest of the exceptional Lie groups: $G_2$, its definition and different characterizations joint with its relationship with $\mathbb{S}^6$. With the exception of the summary of the Killing-Cartan classification, this survey is self-contained, and all the proofs are given, mainly following linear algebra arguments. Although these proofs are well-known, they are spread and some of them are difficult to find. The approach is algebraical, working at the Lie algebra level most of times. We analyze the complex Lie algebra (and group) of type $G_2$ as well as the two real Lie algebras of type $G_2$, the split and the compact one. Octonions will appear, but it is not the starting point. Also, 3-forms approach and spinorial approach are viewed and related. eng open access by-nc-nd Lie, Algebras de, excepcionales The exceptional Lie group G2 conference output