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Dec 14, 2018 at 18:00 comment added Alice By the way, in case anyone else is interested I found the following useful alternate perspective in an answer of Tom Church (which is basically dual to this answer): mathoverflow.net/a/31422/132417
Dec 14, 2018 at 17:58 vote accept Alice
Dec 14, 2018 at 15:54 history answered spin CC BY-SA 4.0