"In France, where geometry began to be cultivated with greatest success, Roberval, Fermat, Pascal, employed the and made new improvements in it. Giles Persone de Roberval... claimed for himself the invention of the Method... Roberval and Pascal improved the rational basis of the Method of Indivisibles, by considering an area as made up of an indefinite number of rectangles instead of lines, and a solid as composed of indefinitely small solids instead of surfaces. Roberval applied the method to the finding of areas, volumes, and centres of gravity. He effected the quadrature of a parabola... [and] cycloid. Roberval is best known for his method of drawing tangents, which, however, was invented at the same time if not earlier by Torricelli. Torricelli's appeared in 1644 under the title Opera geometrica. Roberval gives the fuller exposition of it."
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History of calculus
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