Golden ratio

The Golden Ratio, often denoted by the Greek letter phi (φ), is a special mathematical ratio that is approximately equal to 1.6180339887.

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Codex  0 Created 2026-09-24 Updated 2026-10-03

The golden ratio is the positive number

φ = \frac{1 + 5}{2},

which satisfies

φ^{2} = φ + 1

and

1/ φ = φ - 1