case be dropped from such definition. Since the rod is stationary in K₀, the distance between the marks is the proper length of the rod regardless of the time lapse between the two markings. On the other hand, it is not the proper distance between the marking events if the marks are not made simultaneously in K₀."

Proper distance between two events in flat space

In special relativity, the proper distance between two spacelike-separated events is the distance

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