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Two-dimensional test function based on the formula $$f(\mathbf{x}) = 0.25 x_1^4 - 0.5 x_1^2 + 0.1 x_1 + 0.5 x_2^2$$ with \(\mathbf{x}_1, \mathbf{x}_2 \in [-10, 10]\).
makeAluffiPentiniFunction()
[smoof_single_objective_function]
smoof_single_objective_function
See https://al-roomi.org/benchmarks/unconstrained/2-dimensions/26-aluffi-pentini-s-or-zirilli-s-function.