coincident characteristic values

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1: 2.9 Difference Equations

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§2.9(ii) Coincident Characteristic Values

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2: 2.7 Differential Equations

… ►See §2.11(v) for other examples. …

3: 3.2 Linear Algebra

… ►is called the characteristic polynomial of $𝐀$ and its zeros are the eigenvalues of $𝐀$. The multiplicity of an eigenvalue is its multiplicity as a zero of the characteristic polynomial (§3.8(i)). … … ►When $𝐀$ is a symmetric matrix, the left and right eigenvectors coincide, yielding $\kappa (\lambda )=1$, and the calculation of its eigenvalues is a well-conditioned problem. … ►Its characteristic polynomial can be obtained from the recursion …