Lower bounds of Copson type for Nörlund matrices Original Research Article

Let A=(an,k)n,kgreater-or-equal, slanted0 be a non-negative matrix. Denote by Lp,q(A) the supremum of those L satisfying double vertical barAXdouble vertical barqgreater-or-equal, slantedLdouble vertical barXdouble vertical barp (Xset membership, variantℓp,Xgreater-or-equal, slanted0), and define image (p>0). We derive a range for the value of image, where 0