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where is the integral sign?

 May 1, 2023
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The first appearance of the integral symbol in print was in a paper by Leibniz in the Acta Eruditorum. The integral symbol was actually a long letter S for "summa." In his Quadratura curvarum of 1704, Newton wrote a small vertical bar above x to indicate the integral of x.

 May 1, 2023

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