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In this Letter, we explicitly classify all modular invariant partition functions for
at levels 2 and 3. Previously, these were known only for level 1. Level 2 exceptions exist at r=9, 15, and 27;level 3 exceptions exist at r=4, 8, and 20. One of these is new, but the others were all anticipated by the rank-level duality relating
level k and
level r+1. The main recent result which this Letter rests on is the classification of
-type invariants. 相似文献
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