Golden mean

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The golden mean, or golden ratio is the positive solution to the quadratic equation, LaTeX: x^2 + x - 1 = 0, which is LaTeX: (\sqrt{5}-1)/2, or approximately LaTeX: 0.618. This has the proportionality property: LaTeX:  x : 1 = (1-x) : x, which defines the placements of evaluations for the golden section search.

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