I wrote a question, and later provided my own answer. I spent a decent amount of time writing up that answer and I would like to have it for my notes, but it seems like it was deleted at some point.
It was a question about how photons can be expressed in a cavity using the transmission function of a cavity (verses solving with the input-output formalism).
Any ideas how I can find this? (I think it was likely deleted more than 60 days ago, although I'd guess I wrote the question some time in the last 6 months.) I'm not so interested in fighting some moderator about whether it should've been deleted, I'd just like to get that answer back for my own reference.