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  1. No. 9887 · q-20261013-advance-20261019-r01-open-closed-set-0012

    Question 9887: Open, Closed, Both, or Neither in One Fixed Topology

    Second-context math/bilingual review

    Question: candidate; English: AI candidate; this page adds no mathematical or formal proof.

    MKO: Open and closed sets Questionsqf-ext19-openclosed-statusbatch-20261013-advance-20261019-r01-open-closed-set-foundations
    Open numbered derivation → Markdown JSON Original batch