## Abstract

The aim of this paper is to introduce and study Lie algebras and Lie groups over noncommutative rings. For any Lie algebra g sitting inside an associative algebra A and any associative algebra F we introduce and study the algebra (g, A) (F), which is the Lie subalgebra of F ⊗ A generated by F ⊗ g. In many examples A is the universal enveloping algebra of g. Our description of the algebra (g, A) (F) has a striking resemblance to the commutator expansions of F used by M. Kapranov in his approach to noncommutative geometry. To each algebra (g, A) (F) we associate a "noncommutative algebraic" group which naturally acts on (g, A) (F) by conjugations and conclude the paper with some examples of such groups.

Original language | English (US) |
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Pages (from-to) | 1723-1758 |

Number of pages | 36 |

Journal | Advances in Mathematics |

Volume | 218 |

Issue number | 6 |

DOIs | |

State | Published - Aug 20 2008 |

## All Science Journal Classification (ASJC) codes

- Mathematics(all)

## Keywords

- Lie algebra
- Lie group
- Noncommutative ring
- Semisimple Lie algebra