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A note on commutators in compact semisimple Lie algebras

Linus Kramer

Vol. 20 (2023), No. 2-3, 317–324
Abstract

Given any two elements A,B in a compact semisimple Lie algebra, we show that there exist elements X,Y,Z such that

A = [X,Y ] andB = [X,Z].

The proof uses Cartan subalgebras and their root systems. We also review some related problems about Cartan subalgebras in compact semisimple Lie algebras.

Dedicated to Jacques Tits

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Keywords
Lie algebra, commutator, Cartan subalgebra
Mathematical Subject Classification
Primary: 22E60
Milestones
Received: 23 August 2022
Revised: 21 March 2023
Accepted: 14 May 2023
Published: 13 September 2023
Authors
Linus Kramer
Mathematisches Institut
Fachbereich Mathematik und Informatik
Universität Münster
Münster
Germany