Is it true that the spectrum of $I + A$, where $A$ is a positive self-adjoint operator and $I$ is the identity, is given by just $\{\lambda_n+1\}$, where $\{\lambda_n\}$ is the spectrum of $A$?
2026-04-08 04:30:39.1775622639
Spectrum of $I + A$, where $A$ is a self-adjoint positive operator
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