If `a_j=0(i!=j)anda_(i j)=4(i=j)`,,then the matrix `A =[a_(i j)]_(n xx n)` is a matrix

If `a_j=0(i!=j)anda_(i j)=4(i=j)`,,then the matrix `A =[a_(i j)]_(n xx n)` is a matrix
by

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If `a_j=0(i!=j)anda_(i j)=4(i=j)`,,then the matrix `A =[a_(i j)]_(n xx n)` is a matrix
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