Boring!
This operator case is surprisingly not necessarily mathematically trivial to describe formally because you often end up getting into the Dirac delta functions/continuous spectrum: as mentioned at: mathematical formulation of quantum mechanics
This is especially interesting for user mode emulation.
Quantum electrodynamics by Lifshitz et al. 2nd edition (1982) Updated 2025-07-11 +Created 1970-01-01
Derived from classical first principles, matches Planck's law for low frequencies, but diverges at higher frequencies.
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