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I think the concepts of Archimedes which are at the birth of infinitasimal infinitesimal calculation, as the definition of length of a circle (hence the concept of pi), $\pi$), and how to calculate the area of ​​a circle from pi. $\pi$.

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I think the concepts of Archimedes which are at the birth of infinitasimal calculation, as the definition of length of a circle (hence the concept of pi), and how to calculate the area of ​​a circle from pi.