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Results tagged with perturbation-theory
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user 38974
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Is Rellich's function valued theorem valid for a rank defficient function valued matrix?
Theorem (Rellich). Let $\boldsymbol{A}(t) : \mathbb{R}\rightarrow\mathbb{C}^{n \times n}$ be a Hermitian matrix function that depends
on $t$ analytically.
(i) The $n$ roots of the characteristic poly …
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