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• 01:20, 20 November 2024 Eric Lengyel talk contribs created page Position (Created page with "The spacetime position $$\mathbf r$$ of a body is given by :$$\mathbf r = ct\,\mathbf e_0 + x\,\mathbf e_1 + y\,\mathbf e_2 + z\,\mathbf e_3 + \mathbf e_4$$ . The position $$\mathbf r$$ has units of length.")