5.2: The Characteristic Polynomial - Mathematics LibreTexts
https://math.libretexts.org/Bookshelves/Linear_Algebra/Interactive_Linear_Algebra_(Margalit_and_Rabinoff)/05%3A_Eigenvalues_and_Eigenvectors/5.02%3A_The_Characteristic_Polynomial
WEBSep 17, 2022 · The characteristic polynomial of \(A\) is the function \(f(\lambda)\) given by \[ f(\lambda) = \det(A-\lambda I_n). \nonumber \] We will see below, Theorem \(\PageIndex{2}\), that the characteristic polynomial is in fact a polynomial.
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