Hyers-Ulam Stability of Unbounded Closable Operators in Hilbert Spaces
arxiv（2024）
摘要
In this paper, we discuss the Hyers-Ulam stability of closable (unbounded)
operators with several interesting examples. We also present results pertaining
to the Hyers-Ulam stability of the sum and product of closable operators to
have the Hyers-Ulam stability and the necessary and sufficient conditions of
the Schur complement and the quadratic complement of 2 × 2 block matrix
𝒜 in order to have the Hyers-Ulam stability.
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