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Isomorphisms of Cartesian Products of $\ell $-Power Series Spaces

Tom 54 / 2006

E. Karapınar, M. Yurdakul, V. Zahariuta Bulletin Polish Acad. Sci. Math. 54 (2006), 103-111 MSC: Primary 46A45. DOI: 10.4064/ba54-2-2

Streszczenie

Let $\ell$ be a Banach sequence space with a monotone norm $\Vert \cdot \Vert_{\ell}$, in which the canonical system $(e_i)$ is a normalized symmetric basis. We give a complete isomorphic classification of Cartesian products $E^{\ell}_0(a)\times E^{\ell}_{\infty}(b) $ where $E^{\ell}_0(a) = K^{\ell}(\exp (-{p}^{-1} a_i))$ and $E^{\ell}_{\infty}(b) = K^{\ell}(\exp ({p} a_i))$ are finite and infinite $\ell$-power series spaces, respectively. This classification is the generalization of the results by Chalov et al. [Studia Math. 137 (1999)] and Djakov et al. [Michigan Math. J. 43 (1996)] by using the method of compound linear topological invariants developed by the third author.

Autorzy

  • E. KarapınarIzmir University of Economics
    Izmir, Turkey
    e-mail
  • M. YurdakulDepartment of Mathematics
    Middle East Technical University
    06531, Ankara, Turkey
    e-mail
  • V. ZahariutaFENS
    Sabancı University
    Istanbul, Turkey
    e-mail

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