228 Index Two-sided ideal, 15 Unit, 9 Unit morphism, 178 Unitary representation of a group, 69 Universal enveloping algebra of a Lie algebra, 24, 35 Virtual representation, 105 Weyl algebra, 17 Weyl group, 163 Young diagram, 110 Young projector, 111 Young tableau, 110 Zariski dense subset, 145
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