Operators and Matrices · Volume 12, Issue 3 The norm of backward difference operator Δ on certain sequence spaces 12-52 Pages 867-880 DOI 10.7153/oam-2018-12-52 Downloads Short PDF Full PDF PNG Authors Hadi Roopaei D. Foroutannia Keywords matrix operator backward difference operator norm Cesàro matrix Hilbert matrix sequence space Subject classes 26D15 40C05 40G05 47B37 47B39