Algebra and Geometry | Part IA, 2002

State the Fundamental Theorem of Algebra. Define the characteristic equation for an arbitrary 3×33 \times 3 matrix AA whose entries are complex numbers. Explain why the matrix must have three eigenvalues, not necessarily distinct.

Find the characteristic equation of the matrix

A=(10000i0i0)A=\left(\begin{array}{ccc} 1 & 0 & 0 \\ 0 & 0 & i \\ 0 & -i & 0 \end{array}\right)

and hence find the three eigenvalues of AA. Find a set of linearly independent eigenvectors, specifying which eigenvector belongs to which eigenvalue.

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