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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:

$\paren {p \implies q} \land \paren {q \implies p}$

That is:

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