On November 11, 1675, German mathematician and polymath Gottfried Wilhelm Leibniz demonstrates integral calculus for the first time to find the area under the graph of y = ƒ(x).
E. Mustefa Jibril*1, Messay Tadese*2. International Research Journal of Modernization in Engineering Technology
and Science, 2 (4):
111-118(April 2020)