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This category contains results about the biconditional operator.
Definitions specific to this category can be found in Definitions/Biconditional.

The biconditional is a binary connective:

$p \iff q$

defined as:

$\left({p \implies q}\right) \land \left({q \implies p}\right)$

That is:

If $p$ is true, then $q$ is true, and if $q$ is true, then $p$ is true.