Morita's relation is a partial order on π-systems of finite, untwisted affine, and hyperbolic Kac-Moody algebras, used to determine all maximal hyperbolic Dynkin diagrams in ranks 3-10.
Peterson and Victor G
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On ${\pi}$-systems of symmetrizable Kac-Moody algebras
Morita's relation is a partial order on π-systems of finite, untwisted affine, and hyperbolic Kac-Moody algebras, used to determine all maximal hyperbolic Dynkin diagrams in ranks 3-10.