Eigenvalues, eigenvectors, and eigenspaces of linear ...
form, so we can read o the three eigenvalues: 1 = 1, 2 = 3, and 3 = 2. (It doesn’t matter the order you name them.) Thus, the spectrum of this matrix is the set f1;2;3g. Let’s nd the 1-eigenspace. We need to solve Ax = 1x. That’s the same as solving (A 1I)x = 0. The matrix A 1Iis 2 4 0 0 0 3 2 0 3 2 1 3 5 which row reduces to 2 4 1 0 1 6 ...
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[1] Eigenvectors and Eigenvalues - MIT Mathematics
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