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math.FA2021
Limiting absorption principle and virtual levels of operators in Banach spaces
Nabile Boussaid, Andrew Comech
We review the concept of the limiting absorption principle and its connection to virtual levels of operators in Banach spaces.
math.AP2021★ 2 cited
Virtual levels and virtual states of linear operators in Banach spaces. Applications to Schroedinger operators
Nabile Boussaid, Andrew Comech
We develop a general approach to virtual levels in Banach spaces. We show that virtual levels admit several characterizations which are essentially equivalent: (1) there are corres…