Does anyone remember Newton's term for integral and derivative?

Answer 1

He called it the Method of Fluxions, as I recall.

Newton's notation wasn't very good, although the British, for nationalistic reasons, followed him for a while. Leibniz was better in that regard.

I don't remember who coined the term "calculus" ... maybe that was Leibniz. The integral sign is an elongated "S", standing for "sum", and there are several notations for the derivative: f'(x) (f-prime); dy/dx (where the "d" stands for "differential", derived from the Greek "delta"); and for derivatives, especially with respect to time, they still use "x dot" with the dot above the x. Electrical engineers use that a lot.

A long time ago I opened Newton's "Principia" and looked at it for fifteen minutes. It was completely unintelligible to me, and I haven't looked at it since. Modern calculus texts are better.