MATH 2331 Lecture Notes - Linear Map

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T : rn rn is said to be invertible if the transformation t ((cid:126)x) = a(cid:126)x = (cid:126)y has a unique solution. If rref (a) = in and rk(a) = n, then a is invertible. : is the matrix a = x1 + x2 + x3 = 3x1 + 8x2 + 2x3 = y1 y2 ( 2i) ( 3i) y3 ( ii) ( 5ii) (+iii) x1 + x2 + x3 = y1 x2. = 2y1 + y2 x3 = 7y1 + 5y2 y3. Because the system of equations had a single unique solution, the matrix is invertible. The inverse should satisfy the following: for some t ((cid:126)x) : rn rn, for a given (cid:126)y, t ((cid:126)y) = (cid:126)x such that t ((cid:126)x) = (cid:126)y. If you are given t ((cid:126)x) = a(cid:126)x = (cid:126)y. To nd a 1, we need to nd rref. 0 0 rk(a) = 3 c. ) a =

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