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Optimizing the objective along a line: LaTeX: \mbox{opt} \{ f(x + \alpha \, d): s \ge 0\}, where LaTeX: x is a given point and LaTeX: d is a given direction vector (LaTeX: \alpha is a scalar). A coarse tolerance could be used, so "Opt" is not entirely accurate. (In fact, there are reasons to believe not optimizing is best.)

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