Verify the Cayley-Hamilton Theorem for A = The Cayley-Hamilton Theorem can be used to calculate powers and
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The Cayley-Hamilton Theorem can be used to calculate powers and inverses of matrices. For example, if A is a 2 à 2 matrix with characteristic polynomial cA(λ) = λ2 + aλ + b, then A2 + aA + bI = O, so
It is easy to see that by continuing in this fashion we can express any positive power of A as a linear combination of I and A. From A2 + aA + bI = O, we also obtain A(A + aI ) = -bI, so
provided b 0.
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