Mistake: Example 4.11, step 1, the computation of the Characteristics Polynomial of A

[AI-Ahmed]

Describe the mistake There is a computation error of the eigenvalue and the eigenvector (Step 1).

Location Please provide the

1. version (bottom of page): Draft (2023-02-15)
2. Chapter: Chapter 04
3. page: pp.117-118
4. line number/equation number: 4.11

Proposed solution I computed the characteristic polynomial online if you want to get back to it: Step 01: Characteristic Polynomial of Example 4.11

The Quadratic function should be $\lambda^2-5\lambda + 7.25$ Instead of $\lambda^2-5\lambda + \frac{21} 4$. Therefore, $\lambda_1 \approx 1.5389$ and $\lambda_2 \approx 4.7110$

Additional context This issue will affect the whole example's solution, so the entire model needs to be recomputed again.

[mpd37]

You computed the eigenvalues of the wrong matrix: Entry [2,1] should be -1, not +1. If you change this (I did that in the link you provided), you'll get the same answer that we have.

[AI-Ahmed]

Sorry about that. Thank you so much for the clarification!