Recently, Philippines president Rodrigo Dutarte threatened to resign if anyone could prove that God exists. It turns out that the great mathematician Leonhard Euler (1707–1783) offered a proof of the existence of God. Today, Euler is considered one of the greatest mathematicians of all time. His interests covered almost all aspects of mathematics, from geometry to calculus to trigonometry to algebra to number theory, as well as optics, astronomy, cartography, mechanics, weights and measures and even the theory of music. Much of the notation used by mathematicians today – including e, i, f(x), ∑, and the use of a, b and c as constants and x, y and z as unknowns – was either created, popularized or standardized by Euler. Read More ›