On post-Lie algebras, Lie--Butcher series and moving frames

Hans Munthe-Kaas Alexander Lundervold 1, *
* Auteur correspondant
1 ALEA - Advanced Learning Evolutionary Algorithms
Inria Bordeaux - Sud-Ouest, UB - Université de Bordeaux, CNRS - Centre National de la Recherche Scientifique : UMR5251
Abstract : Pre-Lie (or Vinberg) algebras arise from flat and torsion-free connections on differential manifolds. They have been studied extensively in recent years, both from algebraic operadic points of view and through numerous applications in numerical analysis, control theory, stochastic differential equations and renormalization. Butcher series are formal power series founded on pre-Lie algebras, used in numerical analysis to study geometric properties of flows on euclidean spaces. Motivated by the analysis of flows on manifolds and homogeneous spaces, we investigate algebras arising from flat connections with constant torsion, leading to the definition of post-Lie algebras, a generalization of pre-Lie algebras. Whereas pre-Lie algebras are intimately associated with euclidean geometry, post-Lie algebras occur naturally in the differential geometry of homogeneous spaces, and are also closely related to Cartan's method of moving frames. Lie--Butcher series combine Butcher series with Lie series and are used to analyze flows on manifolds. In this paper we show that Lie--Butcher series are founded on post-Lie algebras. The functorial relations between post-Lie algebras and their enveloping algebras, called D-algebras, are explored. Furthermore, we develop new formulas for computations in free post-Lie algebras and D-algebras, based on recursions in a magma, and we show that Lie--Butcher series are related to invariants of curves described by moving frames.
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https://hal.inria.fr/hal-00835061
Contributeur : Alexander Lundervold <>
Soumis le : mardi 18 juin 2013 - 08:04:41
Dernière modification le : jeudi 11 janvier 2018 - 01:51:41

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  • HAL Id : hal-00835061, version 1
  • ARXIV : 1203.4738

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Hans Munthe-Kaas, Alexander Lundervold. On post-Lie algebras, Lie--Butcher series and moving frames. 2013. 〈hal-00835061〉

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