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AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
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The STUDIA UNIVERSITATIS BABEŞ-BOLYAI issue article summary The summary of the selected article appears at the bottom of the page. In order to get back to the contents of the issue this article belongs to you have to access the link from the title. In order to see all the articles of the archive which have as author/co-author one of the authors mentioned below, you have to access the link from the author's name. |
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STUDIA MATHEMATICA - Issue no. 2 / 2009 | |||||||
Article: |
FUGLEDE-PUTNAM THEOREM FOR LOG-HYPONORMAL OR CLASS Y OPERATORS. Authors: SALAH MECHERI, AISSA NASLI BAKIR. |
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Abstract: The equation AX = XB implies A*X = XB* when A and B are normal is known as the familiar Fuglede-Putnam’s theorem. In this paper we will extend Fuglede-Putnam’s theorem to a more general class of operators. We show that if A is log-hyponormal and B* is a class Y operator, then A,B satisfy Fuglede-Putnam’s theorem. Other related results are also given. Key words and phrases: Fuglede-Putnam’s theorem, log-hyponormal operator, class Y operator. |
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