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  • curprev 14:1114:11, 29 October 2022 Equinox talk contribs 786 bytes +786 Created page with "==English== {{wp}} ===Etymology=== Proposed in 1909 by {{w|Paul Ehrenfest}}. ===Proper noun=== {{en-prop|head=the Ehrenfest paradox}} # {{lb|en|physics}} A relativistic paradox concerning the concept of Born rigidity within special relativity, where an ideally rigid cylinder that is made to rotate about its axis of symmetry. The radius ''R'' as seen in the laboratory frame is always perpendicular to its motion and should therefore be equal to its v..."