## 254A, Notes 1: Lie groups, Lie algebras, and the Baker-Campbell-Hausdorff formula (via What's new)

$254A, Notes 1: Lie groups, Lie algebras, and the Baker-Campbell-Hausdorff formula$ In this set of notes, we describe the basic analytic structure theory of Lie groups, by relating them to the simpler concept of a Lie algebra. Roughly speaking, the Lie algebra encodes the “infinitesimal” structure of a Lie group, but is a simpler object, being a vector space rather than a nonlinear manifold. Nevertheless, thanks to the fundamental theorems of Lie, the Lie algebra can be used to reconstruct the Lie group (at a local l … Read More

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