# November 11, 1675

## Description

Gottfried 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## Location

Holy Roman Empire## Rate

Very important (8)## Sphere

Science## Quotations

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.