| 21. | In the opening round he lost to German Philipp Kohlschreiber in three close sets.
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| 22. | Is a closed map, i . e . maps closed sets onto closed sets.
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| 23. | Another equivalent formulation of the union-closed sets conjecture uses the language of graph theory.
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| 24. | The structure of a topological space may be defined as an closed set topology.
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| 25. | She also won the 1989 French Open at Graf's expense in three close sets.
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| 26. | That is, the closed sets are those of the form
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| 27. | In the quarterfinals, Roddick lost in five close sets to Richard Gasquet of France.
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| 28. | ;normal if any two disjoint closed sets have disjoint neighbourhoods.
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| 29. | It is not so difficult; remember that the intersection of closed set is closed.
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| 30. | The indicator function of a closed set is upper semicontinuous.
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