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I never learned about open and closed "sets" in R, in high school, only intervals.
by SamReidHughes 5y ago
I never learned about open and closed "sets" in R, in high school, only intervals.
- Nitrolo 5y agoI guess all intervals are sets (they are a collection of numbers after all) but not all sets are intervals. Any mathematicians here to tell me if I just said something stupid?
- SamReidHughes 5y agoNo, that's correct.
- BlueTemplar 5y agoIndeed, sets come later, around university, and I would assume that most university fields that use mathematics do NOT need to care about some sets like R (and C ?) having the clopen property ?