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    <h1>Brown Function</h1>
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    <p>This function belongs the the unimodal single-objective test functions. The
function is forumlated as
$$f(\mathbf{x}) = \sum_{i = 1}^{n} (\mathbf{x}_i^2)^{(\mathbf{x}_{i + 1} + 1)} + (\mathbf{x}_{i + 1})^{(\mathbf{x}_i + 1)}$$
subject to \(\mathbf{x}_