what i know about fuzzy logic does not give me a warm fuzzy feeling
but i'll jump in head first anyway.
the drawing on the left shows the individual functions uA and uB
their "fuzzyness" lies in the range of values (0 to 1) shown in the individual graphs
the drawing on the right shows their union, according to the rule that you
use the maximum of either A or B to gt the union thereof.
its "fuzziness" likewise lies in the range of values (0 to 1) shown in the "max" graph.