November 11, 1675
DescriptionGottfried Wilhelm Leibniz, a German mathematician and philosopher, independently of Isaac Newton develops the infinitesimal calculus, which comprises differential and integral calculus and introduces widely used mathematical notation
LocationHoly Roman Empire
RateVery important (8)
According to Leibniz's notebooks, a critical breakthrough occurred on November 11, 1675, when he employed integral calculus for the first time to find the area under the graph of a function y = ƒ(x). He introduced several notations used to this day, for instance the integral sign ∫ representing an elongated S, from the Latin word summa and the d used for differentials, from the Latin word differentia. This cleverly suggestive notation for the calculus is probably his most enduring mathematical legacy.