This formula by Leonard Euler, known as Euler’s identity, was called “the most remarkable formula in mathematics” by Richard Feynman, for its single uses of the notions of addition, multiplication, exponentiation, and equality, and the single uses of the important constants 0, 1, *e*, *i* and π. In 1988, readers of the *Mathematical Intelligencer* voted it “the Most Beautiful Mathematical Formula Ever”. In total, Euler was responsible for three of the top five formulae in that poll.

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