Transcription of Lie algebras - people.math.harvard.edu
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Lie algebrasShlomo SternbergApril 23, 20042 Contents1 The Campbell Baker Hausdorff The problem.. The geometric version of the CBH formula.. The Maurer-Cartan equations.. Proof of CBH from Maurer-Cartan.. The differential of the exponential and its inverse.. The averaging method.. The Euler MacLaurin Formula.. The universal enveloping algebra .. Tensor product of vector spaces.. The tensor product of two algebras .. The tensor algebra of a vector space.. Construction of the universal enveloping algebra .
8 CHAPTER 1. THE CAMPBELL BAKER HAUSDORFF FORMULA A+B+ 1 2 A2 +AB+ 1 2 B2 − 1 2 (A+B+···)2 = A+B+ 1 2 [A,B]+··· where [A,B] := AB−BA (1.1) is the commutator of Aand B, also known as the Lie bracket of Aand B.
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