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Reference.org
Minor (linear algebra)
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<p>In <a href="/facts/Linear_algebra/8VaB4VWk">linear algebra</a>, a minor of a <a href="/facts/Matrix_(mathematics)/qa8FI4ko">matrix</a> A is the <a href="/facts/Determinant/eGYqJ2TF">determinant</a> of some smaller <a href="/facts/Square_matrix/5TP9mNNn">square matrix</a> generated from A by removing one or more of its rows and columns. Minors obtained by removing just one row and one column from square matrices (first minors) are required for calculating matrix cofactors, which are useful for computing both the determinant and <a href="/facts/Inverse_matrix/fPqXk3V8">inverse</a> of square matrices. The requirement that the square matrix be smaller than the original matrix is often omitted in the definition. </p>