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Reference.org
Involution (mathematics)
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<p>In <a href="/facts/Mathematics/pxTouaz4">mathematics</a>, an involution, involutory function, or self-inverse function is a <a href="/facts/Function_(mathematics)/CdReEKCh">function</a> f that is its own <a href="/facts/Inverse_function/Tg5nnXlu">inverse</a>, </p> <i>f</i>(<i>f</i>(<i>x</i>)) = <i>x</i> <p>for all x in the <a href="/facts/Domain_of_a_function/FQvoeUpX">domain</a> of <i>f</i>. Equivalently, applying f twice produces the original value. </p>