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Nov 17, 2011 at 14:44 comment added Vladimir Dotsenko Yes, somehow the relationship between pre-Lie algebras and the Connes--Kreimer story is possible precisely because of lack of power-associativity: this makes the Lie algebra associated to the free pre-Lie algebra on one generator interesting (in particular, non-abelian).
Nov 12, 2011 at 20:10 history edited Dan Fox CC BY-SA 3.0
added to one of the examples
Nov 11, 2011 at 16:05 history edited Dan Fox CC BY-SA 3.0
added example
Nov 11, 2011 at 15:47 history answered Dan Fox CC BY-SA 3.0