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Apr 24, 2017 at 6:40 vote accept 346699
Jan 12, 2015 at 9:15 comment added glS 4-vectors transform linearly, too. For this argument to apply shouldn't you also stress that the matrix $A$ is orthogonal, i.e. that $A \in SO(3)$? (which is easily seen to be of course, but still, just proving that you have a linear transformation isn't enough, is it?)
May 9, 2014 at 16:19 history edited JeffDror CC BY-SA 3.0
added 46 characters in body
Apr 21, 2014 at 13:53 history answered JeffDror CC BY-SA 3.0