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Feb 20, 2016 at 0:21 review Low quality posts
Feb 20, 2016 at 0:47
Feb 19, 2016 at 21:22 comment added Wenzhe Oops, you are right, I need to continue to modulo commutativity issues.
Feb 19, 2016 at 21:18 comment added Robert Israel If $A(t)$ and $A'(t)$ don't commute, this is wrong.
Feb 19, 2016 at 21:16 history answered Wenzhe CC BY-SA 3.0