| http://www.w3.org/ns/prov#value | - Although intuited at least as early as the work of the Milesian physicists, and in modern times particularly by Leibniz, the first law is taken to have been first explicitly discovered in the first part of the last century by Mayer, then Joule, and later Helmholz with the demonstration of the equivalence of heat and other forms of energy, and completed in this century with Einsteins's demonstrat
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