For self-adjoint operators with 0 in the essential spectrum, the unitary, isometric, and spectral distances on different Hilbert spaces coincide; the quasi-unitary distance is equivalent to them up to a universal constant.
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Distances between operators acting on different Hilbert spaces
For self-adjoint operators with 0 in the essential spectrum, the unitary, isometric, and spectral distances on different Hilbert spaces coincide; the quasi-unitary distance is equivalent to them up to a universal constant.