15.

(Continued)

On page 1-7, the truth table indicates that only one combination of switch settings turns on

the light; thus, if, and only if, all switches have a truth value of 1, there is an output. This

is known as the AND function, because switch A and switch B and switch C must all be

closed to produce an output. The Boolean expression for this condition is ABC (read A

and B and C). The logic of an AND function is stated: If, and

if,

all conditions are

, the result will be

.

only

16.

The OR function of Boolean algebra is stated: If any condition or all conditions are true,

true

the result is true. The OR logic is represented by the parallel switching network shown

true

below.

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