feb 21, 1350 - mean speed theorem
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A group known as the “Oxford Calculators” began to study local motion around 1330 and defined, for the first time, the notions of uniform velocity and uniform acceleration and the concept (important in modern dynamics) of “instantaneous velocity.” B. These “Calculators” also devised the “mean speed theorem,” which was proven geometrically by Nicole Oresme around 1350. Oresme’s proof was well known thereafter and reappears as the fundamental axiom of the “new science” of motion in Galileo’s Two New Sciences in 1638.
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