Authors: Eric Su
The length of a rod in motion may be different from the length of another identical rod at rest. The difference in length between two rods is independent of the direction of the motion of the moving rod. The isotropic symmetry demands that the difference in length is conserved in any direction. All moving rods are of identical length as long as the speed of motion is identical. The center of two rods in anti-parallel motion will coincide. The ends will also coincide. Such end-to-end match exists in all reference frames. The length of a rod is independent of reference frame and motion.
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