What does it mean to say a Lie group is real?

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SUMMARY

A Lie group is classified as a real Lie group when it is both a group and a finite-dimensional real smooth manifold. This classification is determined by the nature of the charts in its atlas; if the charts map into R^n, the manifold is considered real, while charts mapping into C^n indicate a complex manifold. Understanding this distinction is crucial for studying the properties and applications of Lie groups in mathematics and physics.

PREREQUISITES
  • Understanding of Lie groups and their properties
  • Familiarity with smooth manifolds and their definitions
  • Knowledge of real and complex number systems
  • Basic concepts of differential geometry
NEXT STEPS
  • Research the properties of finite-dimensional real smooth manifolds
  • Explore the differences between real and complex Lie groups
  • Learn about the applications of Lie groups in physics, particularly in symmetry and conservation laws
  • Study the role of charts and atlases in manifold theory
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Mathematicians, physicists, and students studying differential geometry or group theory who seek to deepen their understanding of Lie groups and their classifications.

pellman
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If the charts of your atlas map into R^n the manifold is real, if they map intor C^n it is complex.
 
Thanks. Makes sense.
 

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