If 2 simple statements “p” & “q” are connected by the connective. 'if & only if', then the resulting compound statement is said to be as the biconditional statement. Symbolically it is characterized by p<-> q.
An integer is even if & only if it is divisible by two. Then it is biconditional having the truth value T.
The biconditional statement p <->q is true when either both p & q are true or both p & q are false.
A statement is said to be as biconditional when it expresses the idea which presence of some property is a necessary & sufficient condition for the presence of some other property. Such a statement is usually phrased in the terms "P, if & only if Q." The phrase "if & only if" is often abbreviated as iff.
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