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Feb 26, 2013 at 19:21 comment added Jim Humphreys It helps to explain the notation and setting more explicitly. Aside from that, it's unclear how you distinguish a projective representation from an ordinary one when the group itself is constructed from the usual unitary group by factoring out its center.
Feb 26, 2013 at 16:16 answer added Venkataramana timeline score: 10
Feb 26, 2013 at 15:18 history asked Huangjun Zhu CC BY-SA 3.0