Abstract
We prove a more general version of a result announced without proof in [DP], claiming roughly that in a partially integrable highest weight module over a Kac-Moody algebra the integrable directions from a parabolic subalgebra.
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Dimitrov, I., Penkov, I. Partially integrable highest weight modules. Transformation Groups 3, 241–253 (1998). https://doi.org/10.1007/BF01236874
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DOI: https://doi.org/10.1007/BF01236874