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Dec 1, 2017 at 16:43 history edited Matthew Daws CC BY-SA 3.0
Correct
Dec 1, 2017 at 16:43 comment added Matthew Daws Yes, well spotted. $b=2c$ (from some paper calculation I did). Answer corrected.
Dec 1, 2017 at 15:51 comment added Igor Khavkine What is $b$? I get that the commutator of $MS_1$ and $MS_2$ vanishes when $a=c$.
Dec 1, 2017 at 15:39 vote accept Schüler
Dec 1, 2017 at 14:48 history answered Matthew Daws CC BY-SA 3.0