Question: 32. If A is an m x n matrix with columns a i , show that vec(A) = n i=1 (a i x e

32. If A is an m x n matrix with columns ai, show that vec(A) = Σni=1 (ai x ei)

= vec[Σni=1 aiei], where ei is the i-th column of the n x n identity matrix.

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