Euler's Identity T-Shirt
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Euler's identity is considered to be an exemplar of mathematical beauty because it shows a profound connection between five fundamental mathematical constants and three of the basic arithmetic operations occur exactly once each: addition, multiplication, and exponentiation. The five fundamental math constants are: the number 0, the additive unit; The number 1, the multiplicative unit; The number π (π = 3.141...); The number e (e = 2.718...), Euler's number; and The number i, the imaginary unit of the complex numbers.