This multiplication might make it easier to understand if you look at the matrix as a vector of vectors. If we let a_i = ({1, i} a_, a_ {i, 2}, ldots, a_ {i, n}), is a vector that contains the Member is a member in a row i of A, and let b_j = (b_ {1, j}, b_ {2, j}, ldots, b_ {n, j}) is a vector that contains the parent members are members of j B and then we'll have that c_ {i, j} cdot b_j cdot a_i = a_i when b_j is the product of a_i and b_j.
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