∫

See also: ſ [U+017F LATIN SMALL LETTER LONG S] and ʃ [U+0283 LATIN SMALL LETTER ESH]
∫ U+222B, ∫
(LaTeX: \int)
INTEGRAL
← ∪
[U+222A] 		Mathematical Operators ∬ →
[U+222C]
⌠ U+2320, ⌠
TOP HALF INTEGRAL
← ⌟
[U+231F] 		Miscellaneous Technical ⌡ →
[U+2321]
⌡ U+2321, ⌡
BOTTOM HALF INTEGRAL
← ⌠
[U+2320] 		Miscellaneous Technical ⌢ →
[U+2322]

Translingual

Etymology

Gottfried Leibniz based the symbol on the Latin word summa (“sum”), which he wrote ſumma (with a long s 'ſ' ). This use first appeared publicly in his paper De Geometria, published in Acta Eruditorum of June, 1686,[1] but he had been using it in private manuscripts since at least 1675.[2]

Symbol

∫

  1. (mathematics) Denotes the integral

References

  1. ↑ Mathematics and its History, John Stillwell, Springer 1989, p. 110
  2. ↑ Early Mathematical Manuscripts of Leibniz, J. M. Child, Open Court Publishing Co., 1920, pp. 73–74, 80.
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