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Aug 15, 2014 at 12:03 comment added Christian Stump Oh yes, you are right. Thanks for the clarification!
Aug 15, 2014 at 11:45 comment added Geordie Williamson I don't think that this is what he means. The embedding of e.g. H_3 into D_6 doubles lengths, and so doesn't send simple reflections to reflections.
Aug 14, 2014 at 19:08 history answered Christian Stump CC BY-SA 3.0