16. The rank of an \( n \times n \) matrix \( \mathbf{A} \) is equal to the number of nonzero eigenvalues of \( \mathbf{A} \), where eigenvalues are counted according to multiplicity.
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16. The rank of an \( n \times n \) matrix \( \mathbf{A} \) is equal to the number of nonzero eigenvalues of \( \mathbf{A} \), where eigenvalues are counted according to multiplicity.