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A comment on Ways to travel at nearly the speed of light. Parent comment

Re:Ways to travel at nearly the speed of light by somab on Tuesday June 04, 2019 @10:48PM (#20101087)
If you use toroidal boundary conditions then you could remain in an inertial reference frame and return back to the same pont.

See https://en.m.wikipedia.org/wiki/Periodic_boundary_conditions

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