Because the forth and the fifth columns of the truth table are identical, you can conclude that the two statements are equivalent. From the table below you can see that these four statements yield two pairs of logically equivalent implications. A biconditional statement is true when both components are true and when both components are false, as shown in the truth table below. Every painting on display is for sale. Not all corporations have male chief executive officers.
All squares are parallelograms.
Here are some of the most common negations involving quantifiers. All p are q Some p are not q 2. Some p are q. Some p are not q. All p are q 4.