# The Golden Ratio

The real number τ defined by:

`\tau := 1/2 (1 + \sqrt(5)) = 1.61803398874989484820459...`

It is an algebraic number of degree two, being the larger of the two roots of the quadratic equation:

`x^2 - x - 1 = 0.`

The real number τ defined by:

`\tau := 1/2 (1 + \sqrt(5)) = 1.61803398874989484820459...`

It is an algebraic number of degree two, being the larger of the two roots of the quadratic equation:

`x^2 - x - 1 = 0.`