There is a famous formula, perhaps the most compact and famous of all — Euler's identity

"One of the most frequently mentioned equations was Eulers equation, e^{i \pi} + 1 = 0. \,\! Respondents called it "the most profound mathematical statement ever written"; "uncanny and sublime"; "filled with cosmic beauty"; and "mind-blowing". Another asked: "What could be more mystical than an imaginary number interacting with real numbers to produce nothing?" The equation contains nine basic concepts of mathematics — once and only once — in a single expression. These are: e (the base of natural logarithms); the exponent operation; π; plus (or minus, depending on how you write it); multiplication; imaginary numbers; equals; one; and zero."

"-1 = e^iπ, proves that Euler was a sly guy."

"Like a Shakespearean sonnet that captures the very essence of love, or a painting that brings out the beauty of the human form that is far more than just skin deep, Eulers equation reaches down into the very depths of existence."

"Gentlemen, that is surely true, it is absolutely paradoxical; we cannot understand it, and we dont know what it means. But we have proved it, and therefore we know it must be the truth."