The transpose of a matrix is obtained by interchanging rows and columns of A .

Operation of Transpose of a Matrix and its Properties

Definition 7.16

The transpose of a matrix is obtained by interchanging rows and columns of A and is denoted by AT.

More precisely, if A = [aij ]m×n , then AT = [bij ]n×m , where bij = a ji so that the (i, j)th entry of AT is a ji .

For instance,

We state a few basic results on transpose whose proofs are straight forward.

For any two matrices A and B of suitable orders, we have

(i) ( AT )T = A

(ii) (kA)T = kAT (where k is any scalar)

(iii) ( A + B)T = AT + BT

(iv) ( AB)T = BT AT (reversal law on transpose)

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