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Baker-Hausdorff Lemma

  1. Oct 7, 2012 #1
    I'm studying QM out of Sakurai's book and on page 95 (equation 2.3.47), he states the Baker-Hausdorff Lemma without proof. I've scoured the internet in search of an elementary proof (i.e. one that does not rely on lie algebras, etc.), but have come up empty. I was wondering if anyone knew of a place I could find a proof online.
  2. jcsd
  3. Oct 7, 2012 #2


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    Check out problems 3.3 & 3.4 in the text on Quantum Mechanics by Ballentine. They are solved in the appendix D. It should be a start to the general formula, indeed without involving topological issues.
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