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A Very Ancient Way of Doing Calculus

5 min readAug 5, 2025
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Geometria, p. 99: If two parallel planes are drawn through opposite tangents of any given plane figure, straight or inclined to the plane of the given figure, extended indefinitely on both sides; one of which is moved towards the other, always remaining equidistant until it coincides with it: the individual straight lines, which during the entire motion form common intersections of the moving plane and the given figure, are called taken together the “lines of the figure”: All the lines of such a figure, taken together, are called its “ruling lines”; and this when the planes are perpendicular to the given figure. But when they are inclined to it, they are called “inclined ruling lines.” All the lines of the same oblique passage through the given figure are similarly called one “ruling.”

Ancient Foundations of Calculus

Bonaventura Cavalieri

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During the 3rd century BC, Archimedes outdid Cavalieri. Read the Archimedes Palimpsest.

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🙄🤔😳🤔🤔🤔🤔🤔🤔🤔😇😇😇😇😇🤦‍♀️🤦

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