3 papers
math.SP2025
Quasi self-adjoint extensions of a class of formally non-self-adjoint discrete Hamiltonian systems
Guojing Ren, Guixin Xu
This paper is concerned with the characterizations of quasi self-adjoint extensions of a class of formally non-self-adjoint discrete Hamiltonian systems. Some properties of the sol…
math.FA2024
Quasi-selfadjoint extensions of dual pairs of linear relations
Guixin Xu, Guojing Ren
This paper investigates quasi-selfadjoint extensions of dual pairs of linear relations in Hilbert spaces. Some properties of dual pairs of linear relations are given and an Hermiti…
math.SP2023
Friedrichs extensions for a class of singular discrete linear Hamiltonian systems
Guojing Ren, Guixin Xu
This paper is concerned with the characterizations of the Friedrichs extension for a class of singular discrete linear Hamiltonian systems. The existence of recessive solutions and…