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Oct 14, 2015 at 9:36 comment added Andreas Cap @SebastianGoette: Thanks for the comment, I've edited accordingly.
Oct 14, 2015 at 9:36 history edited Andreas Cap CC BY-SA 3.0
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Oct 14, 2015 at 9:05 vote accept QSR
Oct 14, 2015 at 8:37 comment added Sebastian Goette You should say in addition that the action of A_4 on R^4 splits as in Asghar's comment, and that the actions on both parts lift to SO(3).
Oct 14, 2015 at 7:30 history answered Andreas Cap CC BY-SA 3.0