Let A be an n xn matrix and f(r) = Cr* + ... + cr + co, a polynomial. By f(A) we mean the n x n matrix Ck A* + ck-1Ak-1+….+cqA+ coIn•. Prove if A is an nxn matrix then there exists a polynomial f of degree at most n2 such that f(A) = 0,xn- Note you cannot simply quote a theorem like Cayley-Hamilton, you have to prove it yourself.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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### Problem Statement

Let \( A \) be an \( n \times n \) matrix and \( f(x) = c_k x^k + \dots + c_1 x + c_0 \), a polynomial. By \( f(A) \) we mean the \( n \times n \) matrix:

\[ f(A) = c_k A^k + c_{k-1} A^{k-1} + \cdots + c_1 A + c_0 I_n. \]

Prove that if \( A \) is an \( n \times n \) matrix then there exists a polynomial \( f \) of degree at most \( n^2 \) such that \( f(A) = 0_{n \times n} \).

Note: you cannot simply quote a theorem like Cayley-Hamilton, you have to prove it yourself.
Transcribed Image Text:### Problem Statement Let \( A \) be an \( n \times n \) matrix and \( f(x) = c_k x^k + \dots + c_1 x + c_0 \), a polynomial. By \( f(A) \) we mean the \( n \times n \) matrix: \[ f(A) = c_k A^k + c_{k-1} A^{k-1} + \cdots + c_1 A + c_0 I_n. \] Prove that if \( A \) is an \( n \times n \) matrix then there exists a polynomial \( f \) of degree at most \( n^2 \) such that \( f(A) = 0_{n \times n} \). Note: you cannot simply quote a theorem like Cayley-Hamilton, you have to prove it yourself.
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