page 118 eq 4.60&61 Diagonal matrix is wrong a11 and a22 should be replaced with one another

[gorkemcanates]

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[mpd37]

According to my computation, the matrix is correct.

A = 1/2 * np.array([[5,-2],[-2,5]])
P = np.array([[1,1],[-1,1]])/np.sqrt(2)

np.linalg.inv(P) @ A @ P 
array([[3.5, 0. ],
           [0. , 1.5]])