On $\ddot{I}€$-systems of symmetrizable Kac-Moody algebras

K. N. Raghavan, Krishanu Roy, S. Viswanath

Given a symmetrizable Kac-Moody algebra $\mathfrack{g}$, we study its $\ddot{I}€$-systems, which are subsets of real roots, the pairwise differences of whose elements are not roots. Such…