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Apr 19, 2016 at 13:43 vote accept ronggang
Apr 19, 2016 at 13:43
Apr 18, 2016 at 6:29 comment added Uri Bader I made further edits in order to emphasize the $\mathbb{Q}$-structure in the above example and to address the question asked in a comment to the original question.
Apr 18, 2016 at 6:27 history edited Uri Bader CC BY-SA 3.0
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Apr 17, 2016 at 18:09 comment added Uri Bader Notation fixed, definitions clarified - Thank you.
Apr 17, 2016 at 18:08 history edited Uri Bader CC BY-SA 3.0
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Apr 16, 2016 at 22:35 comment added nfdc23 The statement "The groups happens to be ${\rm{SL}}_2 \times {\rm{SL}}_2$" is potentially confusing: that is as a $\mathbf{C}$-group, not as an $\mathbf{R}$-group (so it may create a mistaken picture for the intended $\mathbf{Q}$-group).
Apr 16, 2016 at 19:33 history edited Uri Bader CC BY-SA 3.0
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Apr 16, 2016 at 15:15 history answered Uri Bader CC BY-SA 3.0