Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun mathematics Denotes the integral

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

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, but he had been using it in private manuscripts since at least 1675.

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