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    <h1>Hosaki Function</h1>
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    <p>Two-dimensional test function \(f\) with
$$f(\mathbf{x}) = (1 - 8 \mathbf{x}_1 + 7 \mathbf{x}_1^2 - 7/3 \mathbf{x}_1^3 + 1/4 \mathbf{x}_1^4)\mathbf{x}_2^2e^{-\mathbf{x}_2}$$
subject to \(0 \leq \mathbf{x}_1 \leq 5\) and \(0 \leq \mathbf{x}_2 \leq 6