3 items with this tag.
C37-3 A type of dilation and contraction of duration and time. This effect also leads to a twin paradox.
C37-3 Proper refers to the fact that a state variable in relativity is measured with respect to a single at rest inertial frame of reference.
C37-3 An ultrarelativistic, subatomic particle which come from stars and undergoes subatomic particle decay at $t_0\approx 2.20\times 10^{-6} \text{ s}$ when at rest.