Definition:Derivative/Notation/Leibniz Notation/Historical Note

Historical Note on 's Notation for Derivative
's notation for a derivative came at about the same time that the manuscript dated $29$th October $1675$ in which the notation for the integral had been devised.

At the same time he introduced the differential symbol $\mathrm d$.

Thus he was soon writing $\mathrm d x$, $\mathrm d y$, and $\dfrac {\mathrm d y} {\mathrm d x}$ soon followed.