1. A Boolean assertion is simply an expression that results in a true or false answer. For example,

   a > 5

   0 == b

   a <= b

   are all statements that will result in a true or false answer.

2. To negate a Boolean assertion means to write the opposite of a given Boolean assertion. For example, given the following Boolean assertions noted as A, the corresponding negated statements are the result of applying the ! operator to A.

   A	!A
   5 == x	5 != x
   x < 5	x >= 5
   x >= 5	x < 5

   
   

3. Notice that negations of Boolean assertions can be used to re-write code. For example:

if (!(x < 5))
   // do something...

can be rewritten as

if (x >= 5)
   // do something ...

This is important because we understand positive statements much more easily than statements that contain one or more !s.