>>12768483no I'm not against addition/multiplication etc. of sets. They are usually afforded definition/explanation when first introduced though, and that's my main issue.
I 100% have a problem with the notation , since the LHS is ostensibly a set, and the RHS is seemingly a specific function. That mainly causes confusion with the "arbitrary constant" like the MSE post above.
To clarify, it's not hard to get a proper setup, I pointed out that a proper setup is not often used. It's a gripe that lingers over me.