After two years of thinking, 1666+00, in June, Newton wrote the first calculus paper in the history of mathematics, Short Theory of Flow Number, and put forward the concept of "Flow Number" historically. Newton mapped the "flow number" to speed, that is, the WeChat service of displacement function to time, and then took the WeChat service of speed versus time as acceleration. After three years of careful consideration, Newton finished his second paper, Analysis with Infinite Polynomial Equation. In this paper, the general method of finding the instantaneous change rate of dependent variable to independent variable is given, and it is also proved that the inverse process of finding the change rate can get the area, which is actually very close to the basic theorem of calculus (Newton-Leibniz formula). 167 1 year, Newton perfected the first article in his third paper, Flow and Infinite Series, which made the discussion and method clearer. Five years later, Newton wrote his most mature calculus paper, Theory of Quadrature of Curves, which further improved the understanding of convection number, clearly described the basic theorem of calculus, and gave a series of marks invented by himself.
At this point, a generation of giants completed the great feat of creating calculus. However, due to his conservative and introverted personality, Newton did not publish his paper publicly for a long time, and only a few of his friends knew it. It was not until 1687 that Newton published his masterpiece Mathematical Principles of Natural Philosophy with the encouragement and request of his good friend Harley. Only then did Newton's calculus work become public. It was Newton's hesitation that triggered a century-long debate between Newton and Leibniz, the "father of calculus", and also caused a long-term gap between the British scientific community and the European scientific community.