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        "description": "This is the original ether/electron-model construction, not the complete later special-relativity interpretation or a proof of covariance for every charge/current system and force. Its material-deformation and electromagnetic-mass assumptions are historical. The account covers selected source passages; it does not independently reconstruct all derivations or certify every formula.",
        "domain": "Moving electromagnetic systems"
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      "sources": [
        {
          "citation": "H. A. Lorentz, Electromagnetic phenomena in a system moving with any velocity smaller than that of light, KNAW Proceedings 6 (1903–1904), 809–831",
          "url": "https://pages.jh.edu/rrynasi1/PhysicalPrinciples/literature/Lorentz1904ElectromagneticPhenomenaInASystemMovingWithAnyVelocitySmallerThanThatOfLight.pdf"
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      "statement": "# Lorentz: transformed variables for moving electromagnetic systems\n\nLorentz developed spatial, local-time and field substitutions for uniformly moving electromagnetic systems and linked corresponding states to selected null optical experiments under explicit force and deformation assumptions.\n\nThe paper seeks a common explanation for several unsuccessful attempts to detect Earth's motion, instead of a separate hypothesis for each experiment. Changes of coordinates, local time and fields connect a moving model with a corresponding reference description. Additional assumptions about electrons and forces are part of the argument, and their historical status remains visible. Einstein's later interpretation is a distinct contribution.\n\n## Scientific scope\n\nThis is the original ether/electron-model construction, not the complete later special-relativity interpretation or a proof of covariance for every charge/current system and force. Its material-deformation and electromagnetic-mass assumptions are historical. The account covers selected source passages; it does not independently reconstruct all derivations or certify every formula.\n\n## People and systems\n\nHendrik Antoon Lorentz\n\n\n\n## Original sources\n\n- [H. A. Lorentz, Electromagnetic phenomena in a system moving with any velocity smaller than that of light, KNAW Proceedings 6 (1903–1904), 809–831](https://pages.jh.edu/rrynasi1/PhysicalPrinciples/literature/Lorentz1904ElectromagneticPhenomenaInASystemMovingWithAnyVelocitySmallerThanThatOfLight.pdf)\n",
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      "title": "Lorentz: transformed variables for moving electromagnetic systems"
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