Table 2 The characterization of the class $\mathbf{(}{\mathit{\lambda }}_{\mathbf{1}}\mathbf{:}{\mathit{\lambda }}_{\mathbf{2}}\mathbf{)}$ with ${\mathit{\lambda }}_{\mathbf{1}}\mathbf{\in }\mathbf{\{}{\mathit{\ell }}_{\mathbf{\infty }}\mathbf{,}\mathit{c}\mathbf{,}{\mathit{c}}_{\mathbf{0}}\mathbf{,}{\mathit{\ell }}_{\mathit{p}}\mathbf{,}{\mathit{\ell }}_{\mathbf{1}}\mathbf{\}}$ and ${\mathit{\lambda }}_{\mathbf{2}}\mathbf{\in }\mathbf{\{}{\mathit{\ell }}_{\mathbf{\infty }}\mathbf{,}\mathit{c}\mathbf{\}}$

From: Domain of the double sequential band matrix in the classical sequence spaces