| 11. | When he was 12, he beat me in one or two close sets.
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| 12. | It is equal to the intersection of all closed sets which contain it.
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| 13. | ;closure of a set is the smallest closed set containing the original set.
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| 14. | I played her a few months ago and lost in three close sets,
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| 15. | The closed sets, as usual, are those whose complement is open.
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| 16. | There are always a few points that decide a close set like that.
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| 17. | Though they played two more close sets, Edberg never was in trouble again.
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| 18. | Is a closed map, i . e . maps closed sets onto closed sets.
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| 19. | In Atlanta, McEnroe won the final over Paul Annacone, prevailing in three close sets.
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| 20. | More formally, one describes it in terms of functions on closed sets of points.
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