Draft:Beale Function

In mathematical optimization, Beale function is a multi-modal function, used to test the performance of optimization algorithms. The function is defined by:

$f(x,y)=(1.5-x+xy)^{2}+(2.25-x+xy^{2})^{2}+(2.625-x+xy^{3})^{3}$ with $(x,y)\in \mathbb {R} ^{2}$

The Beale function is typically constrained to the subset $-5\leq x,y\leq 5$ and admits a unique global minimum at $f(3,0.5)=0$