MathematicsGeneralQuality 83 · Exceptional

Euler's Identity: The Most Beautiful Equation

@author · 2026-08-07 · v1

7 min read

Euler's identity,

e^{i\pi} + 1 = 0

, connects five fundamental constants:

e

i

\pi

, 1, and 0. It emerges from the fact that

e^{i\theta} = \cos\theta + i\sin\theta

— at

\theta = \pi

, the cosine is

-1

and the sine is

0

, giving

e^{i\pi} = -1

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