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Jul 24, 2017 at 21:46 comment added user1379857 $(\partial_t \partial^t + \partial_x \partial^x) \phi = (\partial_t^2 - \partial_x^2) \phi.$ I don't see what the problem is
Jul 24, 2017 at 15:04 comment added saad That explains a lot! Can you please have a look at the edit though?
Jul 24, 2017 at 12:02 vote accept saad
Jul 24, 2017 at 4:43 history answered user1379857 CC BY-SA 3.0