Alladi Ramakrishnan Hall

Maximal closed subroot systems of affine root system

Krishanu Roy

IMSc

Borel-de-Siebenthal's theorem gives the classification of maximal closed subroot systems of a given finite crystallographic root system. In this talk, we will give explicit descriptions of the maximal closed subroot systems of an affine root system. This is a joint work with R. Venkatesh.