Non-scalable Functions

1. Bukin N. 6 Function
   

   2-dimensional continuous convex non-differentiable non-separable multimodal convex non-scalable

2. Easom Function
   

   2-dimensional continuous differentiable separable multimodal non-convex non-scalable

3. Goldstein-Price Function
   

   2-dimensional continuous differentiable non-separable multimodal non-convex non-scalable

4. McCormick Function
   

   2-dimensional continuous differentiable multimodal non-scalable convex