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).
On January 4, 1643, Sir Isaac Newton, famous physicist, mathematician, astronomer, natural philosopher, alchemist and theologian, was born. With his Principia he laid the foundation of modern classical mechanics.Besides he constructed the very first reflecting telescope and independent f Gottfried Wilhelm Leibniz developed differential and integral calculus.