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![]() ![]() ![]() Imagine, for example, a $3 \times 3$ matrix $A$ - symmetric, like correlaton matrix, or asymmetric. ![]() A square matrix is singular, that is, its determinant is zero, if it contains rows or columns which are proportionally interrelated in other words, one or more of its rows (columns) is exactly expressible as a linear combination of all or some other its rows (columns), the combination being without a constant term.
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