Factorizations and Singular Value Estimates of Operators with Gelfand–Shilov and Pilipović kernels

We prove that any linear operator with kernel in a Pilipović or Gelfand–Shilov space can be factorized by two operators in the same class. We also give links on numerical approximations for such compositions. We apply these composition rules to deduce estimates of singular values and establish Schatten–von Neumann properties for such operators.publishedVersionnivå