It is often the case that the pair of functions entering into the
logical relationship have different domain variables. Visualizing this
requires a three-dimensional graph. Let us consider a military
application. We may have an infrared sensor pointed at a distant
vehicle. If the vehicle's engine is running (or has recently been
running), the IR return will be high. We may define a fuzzy set called
Eng1 ne whose membership depends on the relative return of the IR
sensor. We may also have a neural network examining the shape or
other characteristics of the vehicle. One of the output neurons of this
network has been trained to
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