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Maths - Eigenvectors and Eigenvalues of 3×3 Matrix

The method for symbolic computation of eigenvectors and eigenvalues involves first finding the eigenvalues from the characteristic polynomial:

det(M - λ I) = 0

where, in this case for three dimensional matrix M =

m00 m01 m02
m10 m11 m12
m20 m21 m22

which gives the characteristic equation:

-λ³ + λ²(m00 + m11 + i) + λ(m01 m10 + m02 m20 + m21 m12 - m00 m11 - i m00 - i m11) + (m00 m11 i - m00 m12 m21 - m01 m10 i + m10 m02 m21 + m20 m01 m12 - m20 m02 m11) = 0

We then need to solve this cubic equation to give uto 3 values of λ.

We can then substitute these into

m00 - λ m01 m02
m10 m11 - λ m12
m20 m21 m22 - λ
=
0
0
0

which is equivalent to solving 3 simultaneous equations.


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