For our German readers, their Wikipedia article is much more extensive: https://de.wikipedia.org/wiki/Nicht-Identit%C3%A4tsproblem

That said, thank you, I wasn't aware of the concept before!

I tend to enjoy a lot of philosophy; however, reading [1] is having a soporific effect. Might anyone recommend something more detailed than the Wikipedia article but less inscrutable than [1] (more scrutable?)

[1] https://plato.stanford.edu/entries/nonidentity-problem/

This is such an excellent rabbithole, thank you!