Because as early as 1665, Newton had spent a lot of energy on logarithm, and his results were more detailed and concise than Mercator's. After that, Newton constantly improved and perfected the theory of calculus, but he did not announce it to the world.
Driven by strong self-esteem, Newton wrote his first calculus paper in Latin-the analysis of infinite polynomial equations. In the paper, Newton elaborated his mathematical achievements in detail.
Through the recommendation of Professor Barrow, this paper was circulated among famous mathematicians in the British Isles and continental Europe in the form of a manuscript. Soon, Newton's academic thoughts spread all over Europe, and people began to call Newton a scientist.