| 21. | Now, take any empty set ( S1 for example ).
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| 22. | The symbol for the null or empty set is either { } or ?
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| 23. | The empty set and " X " itself are always both closed and open.
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| 24. | This approach also provides the notation for the empty set.
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| 25. | In this context, zero is modelled by the empty set.
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| 26. | A triangular set may merely describe the empty set.
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| 27. | It is the number of bijections from one empty set to another, which is 1.
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| 28. | A player who cannot move because the choice is from the empty set has lost.
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| 29. | Similarly, is the th jump of the empty set.
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| 30. | Further the concept of the empty set exists to represent the absence of any items.
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