Explain the 2 types of fitness + name

[fergunet]

In section 3, create a sub-section with title "Fitness compared" or something like that, describing the two fitness of the equations, and why they have been chosen.

Think a good name and acronym for each one, and refer them across the paper (including graphics) with it, instead "Equation x".

[unintendedbear]

I've assigned this to @fergunet for review and closing

[fergunet]

After equation (4) add a paragraph for closing remarks of this section. "Therefore, in our experimental section we are going to compare both f_acc and f_CS, with different parameters of alpha, because... ". You can close after adding this paragraph.