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- noun mathematics Denotes the
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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