J. Creutzig, W. LInde

Entropy Numbers of Certain Summation Operators

abstract:
Given nonnegative real sequences $a = (\al_k)_{k \in \ZZ}$ and $b = (\be_k)_{k \in \ZZ}$ we study the generated summation operator $$ \S(x) : = \Bigl( \alpha_k \Bigl[\sum_{l