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<p>A = [ A 11 A 12 ⋯ A 1 n A 21 A 2 n ⋮ ⋮ A n 1 A n 2 ⋯ A nn ] font sans bold size *2 A =left[matrix{A_11#A_12#dotsaxis#A_{1n}##A_21#{} #{}#A_{2n}##dotsvert#{}#{}#dotsvert##A_{n1}#A_{n2}#dotsaxis#A_nn}right]</p>