) If A is nilpotent (Am = 0 for some m ≥ 1)then all eigenvalues of A are 0
Question
) If A is nilpotent (Am = 0 for some m ≥ 1)then all eigenvalues of A are 0
Solution
Yes, the statement is correct. If a matrix A is nilpotent, then all its eigenvalues are indeed 0. Here's why:
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Assume A is a nilpotent matrix, which means there exists a positive integer m such that A^m = 0.
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Let λ be an eigenvalue of A, and let x be the corresponding eigenvector. This means that Ax = λx.
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If we raise both sides of the equation to the power of m, we get (A^m)x = λ^m x.
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But we know that A^m = 0, so 0x = λ^m x.
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This implies that λ^m must be 0, because 0 times any vector is still 0.
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The only way for λ^m to be 0 is if λ itself is 0, because any non-zero number raised to a positive power is still non-zero.
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Therefore, all eigenvalues of a nilpotent matrix A are 0.
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