
Fuzzy Logic 243
FIGURE 4 Fuzzy sets “young” and “very young.”
“20 is young is true.”
“20 is young is fairly true.”
“20 is young is very true.”
“20 is young is false.”
The truth values are changed according to the qualiers as shown in (Figure. 5).
We know already is 0.9. That is, the truth value of P is 0.9. For the predicate predi-
cate , we use the membership function “true” in the gure and obtain the truth value
0.9. For , the membership function “fairly true” is used and 0.95 is obtained.
In the same way, we can calculate for and and summarize the truth values in the
following:.
For : 0.9
For : 0.95
For : 0.81
For : 0.1.
FIGURE 5 ...