When Alice is in the co-moving frame, I'm not sure of what Sabine meant by "And now ASSUME that faster than light travel is only allowed forward in time in this particular frame.". This is an assumption so what can she…
When Alice is in the co-moving frame, I'm not sure of what Sabine meant by "And now ASSUME that faster than light travel is only allowed forward in time in this particular frame.". This is an assumption so what can she…