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On hyponormal operators in Krein spaces

Kevin Esmeral; Osmin Ferrer; Jorge Jalk; Boris Lora Castro — 2019

Archivum Mathematicum

In this paper the hyponormal operators on Krein spaces are introduced. We state conditions for the hyponormality of bounded operators focusing, in particular, on those operators $T$ for which there exists a fundamental decomposition $𝕂 = 𝕂^{+} \oplus 𝕂^{-}$ of the Krein space $𝕂$ with $𝕂^{+}$ and $𝕂^{-}$ invariant under $T$ .

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