Feedback on eigenvectors

[earlkraft]

In reference to version 224734d7be7ff0c4a8adb3a206356ea122112f33 thanks for making your text available. In your chapter on eigenvalues I believe there is an example problem with a matrix operation error. The example of a 3x3 matrix where you ask if 2 is an eigenvalue and you subtract 2x id matrix the a33 value is shown as -3, but should it not be -1? thanks