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Two-dimensional test function based on the formula $$f(\mathbf{x}) = (x_1^4 + x_2^4 + 2 x_1^2 x_2^2 - 4 x_1 + 3$$ with \(\mathbf{x}_1, \mathbf{x}_2 \in [-2000, 2000]\).
makeEngvallFunction()
[smoof_single_objective_function]
smoof_single_objective_function
See https://al-roomi.org/benchmarks/unconstrained/2-dimensions/116-engvall-s-function.