Enveloping algebras of preLie algebras, Solomon idempotents and the Magnus formula

Details Enveloping algebras of preLie algebras, Solomon idempotents and the Magnus formula Enveloping algebras of preLie algebras, Solomon idempotents and the Magnus formula

2012-01-10

arxiv.org/abs/1201.2159v1

Mathematics

Quantum Algebra

Scientific paper

We study the internal structure of enveloping algebras of preLie algebras. We show in particular that the canonical projections arising from the Poincar\'e-Birkhoff-Witt theorem can be computed explicitely. They happen to be closely related to the Magnus formula for matrix differential equations. Indeed, we show that the Magnus formula provides a way to compute the canonical projection on the preLie algebra. Conversely, our results provide new insights on classical problems in the theory of differential equations and on recent advances in their combinatorial understanding.

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