# OCME · Knowledge & practice explorer

302 MKO / 1,441 families / 360 batches / 36,000 questions.

36,000 second-context math/bilingual reviewed; 0 display/symbol-checked candidates. Source questions: candidate. English: ai_candidate. No new proof, Lean, SREG or training.

1 results; page 1/1.

## Question 9896: Open, Closed, Both, or Neither in One Fixed Topology

- ID: `q-20261013-advance-20261019-r01-open-closed-set-0021`; number: 9896
- Processing: second_context_reviewed
- MKO: [mko-open-closed-set](/en/mko/mko-open-closed-set/)
- Family: [qf-ext19-openclosed-status](/en/explore/?family=qf-ext19-openclosed-status)
- Batch: [batch-20261013-advance-20261019-r01-open-closed-set-foundations](/en/explore/?batch=batch-20261013-advance-20261019-r01-open-closed-set-foundations)
- [Derivation](/en/questions/q-20261013-advance-20261019-r01-open-closed-set-0021/) / [Markdown](/en/questions/q-20261013-advance-20261019-r01-open-closed-set-0021/index.md) / [JSON](/data/question-derivations/questions/q-20261013-advance-20261019-r01-open-closed-set-0021.json)