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If [A][B]=[I][A][B] = [I][A][B]=[I] then
[B]=[A]T[B] = [A]^T[B]=[A]T
[A]=[B]T[A] = [B]^T[A]=[B]T
[B]=[A]−1[B] = [A]^{-1}[B]=[A]−1
[B]=[A][B] = [A][B]=[A]
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