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Reference.org
P-matrix
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<p>In <a href="/facts/Mathematics/pxTouaz4">mathematics</a>, a P-matrix is a <a href="/facts/Complex_number/2w7mqI7e">complex</a> <a href="/facts/Square_matrix/5TP9mNNn">square matrix</a> with every principal <a href="/facts/Minor_(linear_algebra)/CMudF5Eh">minor</a> is positive. A closely related class is that of P 0 {\displaystyle P_{0}} -matrices, which are the closure of the class of P-matrices, with every principal minor ≥ {\displaystyle \geq } 0. </p>