On hyponormal operators in Krein spaces
Kevin Esmeral, Osmin Ferrer, Jorge Jalk, Boris Lora Castro (2019)
Archivum Mathematicum
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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 for which there exists a fundamental decomposition of the Krein space with and invariant under .