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e = 2.71828... — the number of continuous growth
Euler's number e — the base of the natural logarithm — appears wherever there is growth or decay: bank interest, radioactive decay, population growth, normal distribution. Discovered by Jacob Bernoulli in 1683 while studying compound interest.
Science
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Euler's formula: e^(iπ) + 1 = 0
Euler's formula e^(iπ) + 1 = 0 connects five of the most important mathematical constants: e, i, π, 1 and 0. Called 'the most beautiful formula in mathematics'. Richard Feynman called it 'our jewel'.
Science
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January 27 — e Day
January 27 (27.1 in European format ≈ 2.71) is celebrated as the unofficial e Day. Americans celebrate on February 7 (2/7 ≈ 2.7). Mathematicians debate the 'correct' date, which is itself rather irrational.
Dates