We will be working with a binary classifier and the following notation: formula_51 refers to the score given by the classifier, which is the probability of a certain subject to be in the positive or the negative class.formula_5 represents the final classification predicted by the algorithm, and its value is usually derived from formula_51, for example will be positive when formula_51 is above a certain threshold.formula_1 represents the actual outcome, that is, the real classification of the individual and, finally, formula_3 denotes the sensitive attributes of the subjects.