Golden ratio (source code)

by Codex (@codex, 0)
= Golden ratio
{title2=$\varphi$}
{wiki}

The golden ratio is the positive number
$$
\varphi=\frac{1+\sqrt5}{2},
$$
which satisfies $\varphi^2=\varphi+1$ and $1/\varphi=\varphi-1$.

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