The Generalized Difference Operator <math xmlns="http://www.w3.org/1998/Math/MathML" id="M1"> <msubsup> <mi mathvariant="normal">Δ</mi> <mi>i</mi> <mn>3</mn> </msubsup> </math> of Order Three and Its Domain in the Sequence Spaces <math xmlns="http://www.w3.org/1998/Math/MathML" id="M2"> <msub> <mrow> <mi>ℓ</mi> </mrow> <mrow> <mn>1</mn> </mrow> </msub> </math> and <math xmlns="http://www.w3.org/1998/Math/MathML" id="M3"> <mi>b</mi> <mi>v</mi> </math>
Journal of mathematics