Recently, my question regarding a good introductory book on mathematical risk theory was closed because it was deemed off-topic and not research-level mathematics.

However, I think that multiple similar questions were not closed and garnered loads of responses. Those include:

- "Good books in Modular Representation Theory" (link)
- "Good books on theory of distributions" (link)
- "A good book of functional analysis" (link)

It seems to me these questions are similar to mine. I don't understand that my question was closed while these other questions I just mentioned look rather similar to me.

Furthermore, I think my question *is* about research-level mathematics. The theory of risk measures is a pretty advanced and a difficult topic. So it's not like I'm asking for a good introductory book on, say, calculus.