The compound statement P <=> Q is only true when both P AND Q are the same.
P <=> Q can be said in the following ways:
P is equivalent to Q
P if and only if Q
P is a necessary and sufficient condition for Q
The compound statement P <=> Q is only true when both P AND Q are the same.
P <=> Q can be said in the following ways:
P is equivalent to Q
P if and only if Q
P is a necessary and sufficient condition for Q