3 papers
math.FA2026
The Douglas question for functions of the form with in the disk algebra
Jiawei Wang, Xianfeng Zhao
We prove that the Toeplitz operator is invertible on the Bergman space provided that is bounded below by some positive constant on the open unit disk,…
math.OC2018
Characterization and Approximation of Strong General Dual Feasible Functions
Matthias Köppe, Jiawei Wang
Dual feasible functions (DFFs) have been used to provide bounds for standard packing problems and valid inequalities for integer optimization problems. In this paper, the connectio…
math.OC2017
Structure and Interpretation of Dual-Feasible Functions
Matthias Köppe, Jiawei Wang
We study two techniques to obtain new families of classical and general Dual-Feasible Functions: A conversion from minimal Gomory--Johnson functions; and computer-based search usin…