Maximal closed subroot systems of real affine root systems

Published 25 Jul 2017 in math.RA and math.CO | (1707.07981v4)

Abstract: We completely classify and give explicit descriptions of the maximal closed subroot systems of real affine root systems. As an application we describe a procedure to get the classification of all regular subalgebras of affine Kac Moody algebras in terms of their root systems.

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