Let TA an operator from R2 to R2. W(w1, w2) = TĄ(X1, x2) W1 = -2X1 + 6x2 W2 = 3X1 + 1X2 if TA is invertible, TA is: X(x1, x2) = TA" (w1, w2) : %3D X1 = A w1 + B w2 X2 = C w1 + D w2 %3D

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