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Leibniz makes the first use of the long s (∫) as a symbol of the integral in calculus.
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Gottfried Wilhelm Leibniz
German polymath (1646–1716)
Gottfried Wilhelm Leibniz was a German polymath active as a mathematician, philosopher, scientist and diplomat who is credited, alongside Sir Isaac Newton, with the creation of calculus in addition to many other branches of mathematics, such as binary arithmetic and statistics.…Source: Wikipedia (CC BY-SA)
Long s
Archaic form of the Latin-script letter s (ſ)
The long s, ⟨ſ⟩, also known as the medial s or initial s, is an archaic form of the lowercase letter ⟨s⟩, found mostly in works from the late 8th to early 19th centuries. It replaced one or both of the letters s in a double-s sequence. The modern ⟨s⟩ letterform is known as the…Source: Wikipedia (CC BY-SA)
Integral
Operation in mathematical calculus
In mathematics, an integral is the continuous analog of a sum, which is used to calculate areas, volumes, and their generalizations. Integration, the process of computing an integral, is one of the two fundamental operations of calculus, the other being differentiation.…Source: Wikipedia (CC BY-SA)
Calculus
Branch of mathematics
Calculus is the mathematical study of continuous change, in the same way that geometry is the study of shape, and algebra is the study of generalizations of arithmetic operations.Source: Wikipedia (CC BY-SA)