Flows on Rooted Trees and the Menous-Novelli-Thibon Idempotents
Flows on Rooted Trees and the Menous-Novelli-Thibon Idempotents
Several generating series for flows on rooted trees are introduced, as elements in the group of series associated with the Pre-Lie operad. By combinatorial arguments, one proves identities that characterise these series. One then gives a complete description of the image of these series in the group of series associated …