| 11. | Some authors allow the binary tree to be the empty set as well.
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| 12. | By definition, the empty set is a subset of all sets.
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| 13. | The infimum of the empty set is taken to be + \ infty.
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| 14. | The conjugate closure of the empty set \ varnothing is the trivial group.
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| 15. | You have to try to do untraditional things like empty sets.
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| 16. | The empty set was an idea of mine after the spring,
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| 17. | Note that the empty set is a face of every simplex.
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| 18. | This relation is understood in a comprehensive derivable from the empty set of sentences.
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| 19. | Quine had considered the problem of the empty set unrealistic, which left Lejewski unsatisfied.
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| 20. | The empty set has 0 members and 1 subset, and 2 0 = 1.
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