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math.FA2024
Gaps and relative dimensions
Chenfeng Liao, Chaofeng Zhu
In this paper, the notion of semi-compact perturbation of a closed linear subspace is introduced. Then for a of pair of closed linear subspace of a Banach space such that one is a…
math.FA2024
Skew-adjoint linear relatioins between Banach spaces
Hanchen Li, Chaofeng Zhu
In this paper, we prove the stability theorems for the isotropic perturbations of maximal isotropic subspaces in symplectic Banach spaces. Then we prove a stability theorem for the…