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Reference.org
Unitary element
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<p>In <a href="/facts/Mathematics/pxTouaz4">mathematics</a>, an <a href="/facts/Element_(mathematics)/Q2mx1vHL">element</a> of a <a href="/facts/*-algebra/vcE5TWnT">*-algebra</a> is called unitary if it is <a href="/facts/Inverse_element/CwMygHSj">invertible</a> and its inverse element is the same as its adjoint element. </p>