1707-1783. Swiss mathematician and physicist.
founded graph theory by solving the Seven Bridges of Koenigsberg problem in Koenigsberg (1736)
The most prolific mathematician in history, contributing to calculus, number theory, topology, mechanics, optics, and astronomy.
Introduced modern notation: e, i, pi, sigma summation, f(x) function notation.
Euler's identity (e^(i*pi) + 1 = 0) unifies five fundamental constants in a single equation.
His work on graphs and networks is the mathematical foundation for knowledge graph structure, link analysis, and cyber ranking.