"Nova methodus pro maximis et minimis, itemque tangentibus, quae nec fractas nec irrationales quantitates moratur, et singulare pro illis calculi genus", in Acta Eruditorum. Leibniz' first published work on the differential calculus. (A New Method for Maxima and Minima as well as Tangents, which is neither impeded by fractional nor irrational Quantities, and a remarkable Type of Calculus for them)
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Gary S. Stoudt