History of calculus (Introduction)

In 2002, I took interest in what idea had led to its discovery and checked how calculus and its base had been found out.
I found the order of this discovery to be contrary to that of senior-high-school mathematics, trigonometric functions, natural logarithm, sequence, and calculus.
Please understand the challenge of the following pioneers.
As published at my website, additionally, notice that what I will describe below has no professor as its editor.

Japanese sites
Mathematical Formulas| Kodawari House| Pinpoint StreetView|