duration indicated by a clock
Note 1 to entry: The proper duration ΔτAB is the shortest of the durations Δt′AB in all frames S′ and for inertial frames, ΔτAB=Δt′AB/γ.
Note 2 to entry: For events A and B separated by an infinitesimally small squared space-time interval, the proper duration ΔτAB is the shortest of the durations Δt′AB in all frames S′ and ΔτAB=Δt′AB/γ.
Note 3 to entry: The proper duration is a Lorentz invariant.
Note 4 to entry: The coherent SI unit of proper duration is second, s.
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