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BSeries.LieButcher.PreLie

Planar Pre-Lie Grafting #

This file defines the planar rooted-tree grafting operation which underlies the pre-Lie product on rooted trees. The operation returns the list of all planar trees obtained by grafting the first tree at one vertex of the second tree.

Child-list replacements induced by grafting s at one vertex of a child.

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    All labelled planar trees obtained by grafting s at one vertex of t.

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      Child-list replacements induced by labelled pre-Lie grafting.

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        @[simp]
        theorem BSeries.PLTree.preLieGraftsList_cons {α : Type u} (s t : HopfAlgebras.PLTree α) (ts : List (HopfAlgebras.PLTree α)) :
        preLieGraftsList s (t :: ts) = List.map (fun (t' : HopfAlgebras.PLTree α) => t' :: ts) (preLieGrafts s t) ++ List.map (fun (us : List (HopfAlgebras.PLTree α)) => t :: us) (preLieGraftsList s ts)