3.7.1 Adjoint of a matrix: Let a square matrix A = [aij] of order n and Aij denote the co-factor of aij in |A|, then the adjoint of is defined as:
adjA = [Aij] nxn
Hence, adjA is the transpose of the matrix of corresponding co-factors of elements of |A|.
Then the co-factors of elements of |A| are;
Theorem1: If a square matrix A is of order n, then prove that
A.(adjA) = (adjA).A = |A|.In
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