<p>In this study, we define new Banach sequence spaces <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\ell _{p}(\mathscr {J})\)</EquationSource> </InlineEquation>, <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\ell _{\infty }(\mathscr {J})\)</EquationSource> </InlineEquation>, <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(c_0(\mathscr {J})\)</EquationSource> </InlineEquation> and <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(c(\mathscr {J})\)</EquationSource> </InlineEquation> using a new regular infinite matrix <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(\mathscr {J}= (\mathfrak {j}_{cd})\)</EquationSource> </InlineEquation> which is given by <Equation ID="Equa"> <EquationSource Format="TEX">\(\begin{aligned} \mathfrak {j}_{cd} = {\left\{ \begin{array}{ll} \dfrac{2\textrm{j}_d}{\textrm{j}_{c+2} - 1} &amp; 1 \le d \le c;~\forall c,d = 1,2,3,\cdots \\ \\ 0 &amp; \text {otherwise}, \end{array}\right. } \end{aligned}\)</EquationSource> </Equation>where <InlineEquation ID="IEq6"> <EquationSource Format="TEX">\(\textrm{j}= (\textrm{j}_d)\)</EquationSource> </InlineEquation> is Jacobsthal number sequence. We also introduce various topological, inclusion relations, <InlineEquation ID="IEq7"> <EquationSource Format="TEX">\(\alpha \)</EquationSource> </InlineEquation>-, <InlineEquation ID="IEq8"> <EquationSource Format="TEX">\(\beta \)</EquationSource> </InlineEquation>-, <InlineEquation ID="IEq9"> <EquationSource Format="TEX">\(\gamma \)</EquationSource> </InlineEquation>- duals, matrix mappings and Schauder bases of newly generated sequence spaces. Lastly, compactness of matrix operators on related sequence spaces have been provided using the concept of measure of noncompactness.</p>

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Compactness of Some Matrix Operators Defined on Some New Banach Sequence Spaces Consisting Jacobsthal Numbers

  • Washmin Ara Begum,
  • Rituparna Das

摘要

In this study, we define new Banach sequence spaces \(\ell _{p}(\mathscr {J})\) , \(\ell _{\infty }(\mathscr {J})\) , \(c_0(\mathscr {J})\) and \(c(\mathscr {J})\) using a new regular infinite matrix \(\mathscr {J}= (\mathfrak {j}_{cd})\) which is given by \(\begin{aligned} \mathfrak {j}_{cd} = {\left\{ \begin{array}{ll} \dfrac{2\textrm{j}_d}{\textrm{j}_{c+2} - 1} & 1 \le d \le c;~\forall c,d = 1,2,3,\cdots \\ \\ 0 & \text {otherwise}, \end{array}\right. } \end{aligned}\) where \(\textrm{j}= (\textrm{j}_d)\) is Jacobsthal number sequence. We also introduce various topological, inclusion relations, \(\alpha \) -, \(\beta \) -, \(\gamma \) - duals, matrix mappings and Schauder bases of newly generated sequence spaces. Lastly, compactness of matrix operators on related sequence spaces have been provided using the concept of measure of noncompactness.