The graded representations of an affine Lie algebra
[For the entire collection see Zbl 0742.00067.]Let be the Lie algebra , and let be the universal enveloping algebra for . Let be the center of . The authors consider the chain of Lie algebras . Then is an associative algebra which is called the Gel’fand-Zetlin subalgebra of . A module is called a -module if , where the summation is over the space of characters of and , , . The authors describe several properties of - modules. For example, they prove that if for some ...
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