For the BMS-Kac-Moody algebra, tensor products of finitely many U(h)-free modules with an irreducible restricted module are irreducible exactly when the lambda parameters are pairwise distinct, and the isomorphism class is determined by the original data.
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A new class of irreducible modules over the BMS-Kac-Moody algebra
For the BMS-Kac-Moody algebra, tensor products of finitely many U(h)-free modules with an irreducible restricted module are irreducible exactly when the lambda parameters are pairwise distinct, and the isomorphism class is determined by the original data.