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Math Help - how to build a 3*3 matrix for given eigenvalues

  1. #1
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    how to build a 3*3 matrix for given eigenvalues

    like, lambda1=lambda2=lambda3=2
    lambda1=1,lambda2=2,lambda3=3
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  2. #2
    Lord of certain Rings
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    \begin{pmatrix} 1 & 0 & 0 \\ 0 & 2 & 0 \\ 0 & 0 & 2 \end{pmatrix} for the first example.
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