Sometimes called Hadamard lemma, however, in $n$Lab, Hadamard lemma is another result of Jacques Hadamard, in analysis.

**Hadamardâ€™s formula** relates the Ad action of a Lie group on its tangent Lie algebra, with the ad action of the Lie algebra on itself.

$e^X Y e^{-X} = e^{ad X} (Y)$

- wikipedia Baker-Campbell-Hausdorff formula, section
*Hadarmard lemma*.

Last revised on June 13, 2013 at 04:34:19. See the history of this page for a list of all contributions to it.