Beauty in mathematics is subjective, but one frequently cited candidate is Euler's formula:
\[ e^{i\pi} + 1 = 0. \]
This elegant equation connects five fundamental mathematical constants: \( e \) (the base of natural logarithms), \( i \) (the imaginary unit), \( \pi \) (the ratio of the circumference to the diameter of a circle), 1, and 0. Its simplicity and depth reveal profound relationships between complex analysis, algebra, and geometry, making it a favorite among mathematicians.
Do you have a particular area of math that you find beautiful?