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EN
In this paper we deal with the spectrum of the operator of the first difference A considered as an operator from E to itself where E is one of the sets [...].We apply these results to characterize matrix transformations mapping in E [...] or N. This paper generalizes some results given in [8] and [3].
EN
In this paper we are giving some new properties of the operator of first-difference mapping a space sr into itself and we are dealing with the spaces sr(A h) and sr((A+) ). Next are given some properties of the spaces wr^(A,//),
3
Content available remote Recent results in the infinite matrix theory, and application to Hill equation
EN
In this paper, we give some properties of infinite linear systems and apply them to Hill equation. So we determine Floquet exponent and the space of the solutions.
4
Content available remote On some Banach algebra of infinite matrices and applications
EN
We present in this work some new se
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