Our method consists in merging the n parallel rules in 2 parallel rules and apply the algorithm . But to take into account all the possible combinations, the system makes n-1 ordered aggregations of the n rules and combine the n-1 obtained fuzzy sets.
The principle of the fast algorithm for n parallel rules is:
Results obtained with the formula (10) are close to results obtained with a numeral approach. The figure 9 shows how the core of can be directly obtained with or with . is obtained with and with .
Figure 9: Core computation for three parallel rules.