Summary
We present a self-contained and geometric proof of the standard results about maximal compact subgroups of simple Lie groups. The approach follows an idea suggested by Cartan, and is a variant of a proof given by Richardson in the complex case. We apply techniques associated to geometric invariant theory. The main step in the proof involves an argument with Riemannian metrics of nonpositive curvature.
2000 Mathematics Subject Classifications: 22 E15, 53C35
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Dedicated to Professor Yu I. Manin, on his 70th birthday
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Donaldson, S.K. (2009). Lie Algebra Theory without Algebra. In: Tschinkel, Y., Zarhin, Y. (eds) Algebra, Arithmetic, and Geometry. Progress in Mathematics, vol 269. Birkhäuser Boston. https://doi.org/10.1007/978-0-8176-4745-2_12
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DOI: https://doi.org/10.1007/978-0-8176-4745-2_12
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Publisher Name: Birkhäuser Boston
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Online ISBN: 978-0-8176-4745-2
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