| 21. | Most systems use the current ordinal number of the year as the year label.
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| 22. | All ordinal numbers are declined like an adjective, the forms given here are masculine nominative.
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| 23. | The " Principia " covered only set theory, cardinal numbers, ordinal numbers, and real numbers.
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| 24. | In spoken English, ordinal numbers are also used to quantify the denominator of a fraction.
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| 25. | In English, this part of speech is relatively marginal, and less recognized than ordinal numbers.
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| 26. | This set turns out to have ordinal number ?.
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| 27. | The counting is done in ordinal numbers, " first,"
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| 28. | Alternatively, the sequence of moves might have length some ordinal number other than ? 1.
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| 29. | The position of each element within the ordered set is also given by an ordinal number.
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| 30. | Using successors, limits, and cardinality, Cantor generated an unbounded sequence of ordinal numbers and number classes.
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