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Feb 26, 2017 at 19:45 vote accept Jianrong Li
Feb 26, 2017 at 16:36 answer added Allen Knutson timeline score: 7
Feb 26, 2017 at 16:30 comment added Alex Suciu This is the Poincar\'e--Birkhoff--Witt theorem. Look it up in Jean-Pierre Serre's book on Lie algebras and Lie groups (LNM 1500), or in Christophe Reutenauer's book on Free Lie algebras.
Feb 26, 2017 at 14:25 history asked Jianrong Li CC BY-SA 3.0