A combinatorial basis for the free Lie algebra of the labelled rooted trees

Details A combinatorial basis for the free Lie algebra of the labelled rooted trees A combinatorial basis for the free Lie algebra of the labelled rooted trees

2007-07-30

arxiv.org/abs/0707.4460v1

J.of Lie Theory {\bf 20} (2010), 3--15

Mathematics

Rings and Algebras

12 pages, uses xypic

Scientific paper

The pre-Lie operad can be realized as a space T of labelled rooted trees. A result of F. Chapoton shows that the pre-Lie operad is a free twisted Lie algebra. That is, the S-module T is obtained as the plethysm of the S-module Lie with an S-module F. In the context of species, we construct an explicit basis of F. This allows us to give a new proof of Chapoton's results. Moreover it permits us to show that F forms a sub nonsymmetric operad of the pre-Lie operad T.

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