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Jul 1, 2016 at 3:43 comment added Ri-Li Will you explain how you arrive at the solution? Because I was also thinking about the automorphism $\alpha(x)=\beta_ix_i+\mu_i$
Jul 1, 2016 at 3:42 vote accept Ri-Li
Jun 30, 2016 at 9:14 history answered js21 CC BY-SA 3.0