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Age used in the following description is kazoedoshi (an ordinal number that is used as "in one's (an ordinal number) year").発音を聞く例文帳に追加
年齢は、数え年。 - Wikipedia日英京都関連文書対訳コーパス
ordinal relation (number value indicating order)発音を聞く例文帳に追加
順番を示す数字 - EDR日英対訳辞書
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Wiktionary英語版での「ordinal number」の意味 |
ordinal number
名詞
ordinal number (複数形 ordinal numbers)
- (grammar) A word that expresses the relative position of an item in a sequence.
- (arithmetic) A natural number used to denote position in a sequence.
- (set theory) Such a number generalised to correspond to any cardinal number (the size of some set); formally, the order type of some well-ordered set of some cardinality a, which represents an equivalence class of well-ordered sets (exactly those of cardinality a) under the equivalence relation "existence of an order-preserving bijection".
- 1950, Frederick Bagemihl (translator), Erich Kamke, Theory of Sets, Dover (Dover Phoenix), 2006, page 137,
- For not only do the antinomies a) to e) disappear when we admit as elements of sets only such sets, ordinal numbers, and cardinal numbers as are bounded above by a fixed cardinal number, but we see also that paradoxes always arise if we collect into a set any sets, cardinal numbers, or ordinal numbers which are not bounded above by a fixed cardinal number.
- 1960 [D. Van Nostrand], Paul R. Halmos, Naive Set Theory, 2017, Dover, Republication, page 80,
- Is there a set that consists exactly of all the ordinal numbers? It is easy to see that the answer must be no. If there were such a set, then we could form the supremum of all ordinal numbers. That supremum would be an ordinal number greater than or equal to every ordinal number. Since, however, for each ordinal number there exists a strictly greater one (for example, its successor), this is impossible; it makes no sense to speak of the "set" of all ordinals.
- 2009, Marek Kuczma, Attila Gilányi (editor), An Introduction to the Theory of Functional Equations and Inequalities, Springer (Birkhäuser), 2nd Edition, page 10,
- If is an ordinal number, then by definition any two well-ordered sets of type are similar, i.e., there exists a one-to-one mapping from one set to the other. Consequently these sets have the same cardinality. Consequently to any ordinal number we may assign a cardinal number, the common cardinality of all well-ordered sets of type .
- 1950, Frederick Bagemihl (translator), Erich Kamke, Theory of Sets, Dover (Dover Phoenix), 2006, page 137,
同意語
- (grammar): ordinal, ordinal numeral
- (arithmetic): ordinal
- (order theory): ordinal
反意語
ordinal-number
出典:『Wiktionary』 (2008/08/12 17:42 UTC 版)
ウィキペディア英語版での「ordinal number」の意味 |
Ordinal number
出典:『Wikipedia』 (2011/07/25 09:35 UTC 版)
英語による解説
ウィキペディア英語版からの引用
引用
In set theory, an ordinal number, or just ordinal, is the order type of a well-ordered set. They are usually identified with hereditarily transitive sets. Ordinals are an extension of the natural numbers different from integers and from cardinals. Like other kinds of numbers, ordinals can be added, multiplied, and exponentiated.
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