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The Equivalence of Mass and Energy

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[Revised entry by Francisco Fernflores on August 15, 2019. Changes to: Main text, Bibliography] Einstein correctly described the equivalence of mass and energy as "the most important upshot of the special theory of relativity" (Einstein 1919), for this result lies at the core of modern physics. Many commentators have observed that in Einstein's first derivation of this famous result, he did not express it with the equation (E = mc^2). Instead, Einstein concluded that if an object, which is at rest relative to an inertial frame, either absorbs or emits an amount of energy (L), its inertial mass...

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News source: Stanford Encyclopedia of Philosophy

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