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Reference.org
Trace identity
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<p>In <a href="/facts/Mathematics/pxTouaz4">mathematics</a>, a trace identity is any <a href="/facts/Equation/pxFzLAVR">equation</a> involving the <a href="/facts/Trace_(linear_algebra)/dchFFvHt">trace</a> of a <a href="/facts/Matrix_(mathematics)/qa8FI4ko">matrix</a>. </p>