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References to 'limit superior of sets'
1. Borel-Cantelli lemma by Koro
2. circle has one center by Wkbj79
3. criterion for almost-sure convergence by stevecheng
4. Kurt Mahler by PrimeFan
5. limit of sequence of sets by CWoo
6. normal number by AxelBoldt
7. Poincar\'e recurrence theorem by Koro
8. proof of Borel-Cantelli 2 by kshum
9. top ten coolest numbers by rspuzio