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27/09/1905 Einstein publishes the E = mc2 equation

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The Real Meaning of E=mc² | Space Time | PBS Digital Studios

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Energy-Mass Equivalence

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SR4: Mass-Energy Equivalence - E=mc²

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Einstein's Proof of E=mc²

One of the most famous formulas of all times was published in the scientific journal Annalen der Physik. The title of the article was "Does the Inertia of a Body Depend Upon Its Energy Content?". Einstein actually used L for energy. He wrote: “If a body gives off the energy L in the form of radiation, its mass diminishes by L/c2.”