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math.FA2025
The study of symmetries: some general techniques
Peter Semrl
Let be the set of all self-adjoint bonded linear operators on and a subset that is pertinent in mathematical foundations of quantum mechanics.…
math.FA2025
Approximate isometries of Hilbert spaces
Peter Semrl
We improve the Hyers-Ulam stability result for isometries of real Hilbert spaces by removing the surjectivity assumption.