It's ironic that so many of you are missing the rigour, as that is exactly the thing that "undoes" the CAP arguments.

Anyway, if math is what you guys are missing, it's in this science-paper linked in the article: https://www.researchgate.net/publication/359578461_Continuou...

This is a gentler intro to the concepts. You can also read my essay on why this setup works better than the often used semantics: https://medium.com/p/5e397cb12e63

There's a specific section at the end on why CAP only applies to a very specific subset of SQL databases.