Question

If S and I are non singular then​

Answer 1

A non-singular matrix is a square one whose determinant is not zero. ... It follows that anon-singular square matrix of n × n has a rank of n. Thus, a non-singular matrix is also known as a full rank matrix. For a non-square [A] of m × n, where m > n, full rank means only n columns are independent

Answer 2

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