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Reference.org
Unary function
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<p>In <a href="/facts/Mathematics/pxTouaz4">mathematics</a>, a unary function is a <a href="/facts/Function_(mathematics)/CdReEKCh">function</a> that takes one <a href="/facts/Arity/zSVuwHvP">argument</a>. A <a href="/facts/Unary_operator/kb6CkgsX">unary operator</a> belongs to a subset of unary functions, in that its <a href="/facts/Codomain/MGc43nwQ">codomain</a> coincides with its <a href="/facts/Domain_of_a_function/FQvoeUpX">domain</a>. In contrast, a unary function's domain need not coincide with its range. </p>