The Trecanni function belongs to the unimodal test functions. It is based on the formula $$f(\mathbf(x)) = \mathbf(x)_1^4 - 4 \mathbf(x)_1^3 + 4 \mathbf(x)_1 + \mathbf(x)_2^2.$$ The box-constraints \(\mathbf{x}_i \in [-5, 5], i = 1, 2\) define the domain of defintion.
makeTrecanniFunction()[smoof_single_objective_function]
L. C. W. Dixon, G. P. Szego (eds.), Towards Global Optimization 2, Elsevier, 1978.