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« Physics constructed from a temporal successor relation | Main | Chronos »

May 13, 2009

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Ponder Stibbons

Yes. The quantity s^2 = x^2 + y^2 + z^2 - c^2*t^2 is invariant (taking x, y, z and t here to be the differences in the coordinates of the 2 events, and c to be the speed of light).
http://en.wikipedia.org/wiki/Space_time#Space-time_intervals

Nick Byrd

Thanks Ernani and Ponder. I was puzzled by the same question.

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