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An Elementary Derivation of the Equivalence of Mass and Energy. Haifa, The Hebrew Institute of Technology Haifa, (1946). 4to. Offprint from "Technion Journal. A Yerabook Devoted to the Advancement of Technological Training and Research in Palestine and the Middle East". (4) pp. Clean and fine. First edition in the scarce offprint of an importent paper as it represents Einstein's last and most simple derivation of the energy-mass relation, the famous equivalence expressed in the equation E=mc2.Einstein was never satisfied with his 1905 (and later) derivation(s) of the mass-energy relation. In spite of many strenous efforts he did not succeeded in establishing a general proof of the relation. "That he also always strived for greater generality by narrowing down the range of the postulated premises, can be gathered from the introductory remarks to his last published derivation of 1946 (the paper offered)"(Max Jammer): "The following derivation of the law of equivalence, which has not been published before, has two advantages.Although it makes use of the principle of special relativity, it does not presume the formal machinery of the theory but uses only three kown laws: (1) The law of the conservation of momentum. (2) The expression for the pressure of radiation; that is the momentum of a complex ofradiation moving in a fixed direction. (3) The well known expression for the aberration of light (influenceof the motion of the earth on the apparent location of the fixed stars - Bradley)" (Einstein in the foreword to the offered paper).Weil: 218 - Boni: 253.- Not in Shields. The paper was reprinted in "Out of My Later Years", 1950. [Bookseller: Lynge & Søn A/S]
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