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first appeared publicly in the article "De Geometria Recondita et analysi indivisibilium atque infinitorum" ("On a hidden geometry and analysis of indivisibles and infinites"), published in Acta Eruditorum in June 1686, but he had been using it in private manuscripts at least since 1675. Leibniz first used in the article "Nova Methodus pro Maximis et Minimis" also published in Acta Eruditorum in 1684. While the symbol does appear in private

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