Golden Identity and a Geometric Proof


The Golden Identity or Equation is an exact and beautiful equation that relates 4 fundamental numbers used in maths and physics: i (imaginary number), e (Euler’s number), pi and phi (golden ratio). i is critical in quantum physics, e is related to power laws and fractals, pi is related to circles and phi is related to Fibonacci sequence.

The left side of equation is phi and based on its defining formula, equates to a value which is about 1.618. The right side of the equation which contains e, i and pi is also found to equate to this value, which equals phi (see algebraic proof). The geometric proof shows that phi equals 2 x cos(pi/5), and also that in a regular pentagon with sides = 1, the diagonal is phi.

Another interesting property is that the equation has 5 arithmetic operations: addition, subtraction, multiplication, division and exponentiation.

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