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Compound Invariants and Mixed F-, DF-Power Spaces

Published online by Cambridge University Press:  20 November 2018

P. A. Chalov ,
T. Terzioğlu  and
V. P. Zahariuta
P. A. Chalov
Affiliation:
Department of Mechanics and Mathematics, Rostov State University, Rostov-on-Don, Russia, email: echalov@ns.math.rsu.ru
T. Terzioğlu
Affiliation:
Sabanci University, Istanbul, Turkey
V. P. Zahariuta*
Affiliation:
Sabanci University, Istanbul, Turkey
*
Current address: Feza Gürsey Institute Çengelköy-Istanbul, Turkey email: zaha@mam.gov.tr
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Abstract

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The problems on isomorphic classification and quasiequivalence of bases are studied for the class of mixed $F-$, $\text{DF}$-power series spaces, i.e. the spaces of the following kind

$$G(\lambda ,a)=\underset{p\to \infty }{\mathop{\lim }}\,\text{proj}\left( \underset{q\to \infty }{\mathop{\lim }}\,\text{ind}\left( {{\ell }_{1}}\left( {{a}_{i}}\left( p,q \right) \right) \right) \right),$$

where ${{a}_{i}}(p,\,q)\,=\,\exp \left( \left( p\,-\,{{\lambda }_{i}}q \right){{a}_{i}} \right),\,p,\,q\,\in \,\mathbb{N},\,\text{and}\,\lambda \,\text{=}\,{{\left( {{\lambda }_{i}} \right)}_{i\in \mathbb{N}}},\,a=\,{{({{a}_{i}})}_{i\in \mathbb{N}}}$ are some sequences of positive numbers. These spaces, up to isomorphisms, are basis subspaces of tensor products of power series spaces of $F-$ and $\text{DF}$-types, respectively. The m-rectangle characteristic $\mu _{m}^{\lambda ,a}\left( \delta ,\,\varepsilon ;\,\tau ,\,t \right),\,m\,\in \,\mathbb{N}$ of the space $G\left( \text{ }\!\!\lambda\!\!\text{ ,}\,a \right)$ is defined as the number of members of the sequence ${{({{\lambda }_{i}},{{a}_{i}})}_{i\in \mathbb{N}}}$ which are contained in the union of m rectangles ${{P}_{k}}\,=\,\left( {{\delta }_{k}},\,{{\varepsilon }_{k}} \right]\,\times \,\left( {{\tau }_{k}},\,{{t}_{k}} \right]$ , $k\,=\,1,2,\ldots ,m$. It is shown that each m-rectangle characteristic is an invariant on the considered class under some proper definition of an equivalency relation. The main tool are new compound invariants, which combine some version of the classical approximative dimensions (Kolmogorov, Pełczynski) with appropriate geometrical and interpolational operations under neighborhoods of the origin (taken from a given basis).

Keywords

46A0446A4546M05
Type
Research Article
Information
Canadian Journal of Mathematics , Volume 50 , Issue 6 , 01 December 1998 , pp. 1138 - 1162
Copyright
Copyright © Canadian Mathematical Society 1998

Footnotes

Permanent address: Department of Mechanics and Mathematics Rostov State University Rostov-on-Don Russia

The first author was supported by Tübİtak-Nato Fellowship Program.

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