On some topological properties of generalized difference sequence spaces

Abstract

We obtain some topological results of the sequence spacesΔm(X), whereΔm(X)={x=(xk):(Δmxk)∈X},   (m∈ℕ), andXis any sequence space. We compute thepα-,pβ-, andpγ-duals ofl∞,c, andc0and we investigate theN-(or null) dual of the sequence spacesΔm(l∞),   Δm(c), andΔm(c0). Also we show that any matrix map fromΔm(l∞)into aBK-space which does not contain any subspace isomorphic toΔm(l∞)is compact.