Linear Lie Groups

  • Joachim HilgertEmail author
  • Karl-Hermann Neeb
Part of the Springer Monographs in Mathematics book series (SMM)


We call a closed subgroup \(G \subseteq \mathop {\mathrm {GL}}\nolimits _{n}({\mathbb{K}})\) a linear Lie group. In this section, we shall use the exponential function to assign to each linear Lie group G a vector space
$$\mathop {\bf L{}}\nolimits (G) := \bigl\{ x \in M_n({\mathbb{K}}) \colon \exp({\mathbb{R}}x) \subseteq G\bigr\},$$
called the Lie algebra of G. This subspace carries an additional algebraic structure because, for \(x,y \in \mathop {\bf L{}}\nolimits (G)\), the commutator [x,y]=xyyx is contained in \(\mathop {\bf L{}}\nolimits (G)\), so that [⋅,⋅] defines a skew-symmetric bilinear operation on \(\mathop {\bf L{}}\nolimits (G)\). As a first step, we shall see how to calculate \(\mathop {\bf L{}}\nolimits (G)\) for concrete groups and to use it to generalize the polar decomposition to a large class of linear Lie groups.


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© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  1. 1.Mathematics InstituteUniversity of PaderbornPaderbornGermany
  2. 2.Department of MathematicsFriedrich-Alexander Universität Erlangen-NürnbergErlangenGermany

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