Contravariant forms and extremal projectors
نویسندگان
چکیده
Tensor product of irreducible modules highest weight over a semi-simple quantum group is completely reducible if and only natural contravariant form non-degenerate when restricted to the span singular vectors. We express this restriction through extremal projector providing computationally feasible criterion for complete reducibility tensor products.
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ژورنال
عنوان ژورنال: Journal of Pure and Applied Algebra
سال: 2022
ISSN: ['1873-1376', '0022-4049']
DOI: https://doi.org/10.1016/j.jpaa.2021.106902