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2. Ordinal numeral - Wikipedia

   en.wikipedia.org/wiki/Ordinal_numeral

   Ordinal indicator – Character(s) following an ordinal number (used when writing ordinal numbers, such as a super-script) Ordinal number – Generalization of "n-th" to infinite cases (the related, but more formal and abstract, usage in mathematics) Ordinal data, in statistics; Ordinal date – Date written as number of days since first day of ...

3. Cardinal numeral - Wikipedia

   en.wikipedia.org/wiki/Cardinal_numeral

   In linguistics, and more precisely in traditional grammar, a cardinal numeral (or cardinal number word) is a part of speech used to count. Examples in English are the words one , two , three , and the compounds three hundred [and] forty-two and nine hundred [and] sixty .

4. Numeral (linguistics) - Wikipedia

   en.wikipedia.org/wiki/Numeral_(linguistics)

   [1] [2] Numerals in the broad sense can also be analyzed as a noun ("three is a small number"), as a pronoun ("the two went to town"), or for a small number of words as an adverb ("I rode the slide twice"). Numerals can express relationships like quantity (cardinal numbers), sequence (ordinal numbers), frequency (once, twice), and part . [3]

5. Ordinal number - Wikipedia

   en.wikipedia.org/wiki/Ordinal_number

   So ordinal numbers exist and are essentially unique. Ordinal numbers are distinct from cardinal numbers, which measure the size of sets. Although the distinction between ordinals and cardinals is not always apparent on finite sets (one can go from one to the other just by counting labels), they are very different in the infinite case, where ...

6. Arithmetic - Wikipedia

   en.wikipedia.org/wiki/Arithmetic

   Cardinal numbers, like one, two, and three, are numbers that express the quantity of objects. They answer the question "how many?". Ordinal numbers, such as first, second, and third, indicate order or placement in a series. They answer the question "what position?". [18] A number is rational if it can be represented as the ratio of two

7. Von Neumann cardinal assignment - Wikipedia

   en.wikipedia.org/wiki/Von_Neumann_cardinal...

   Every finite ordinal (natural number) is initial, but most infinite ordinals are not initial. The axiom of choice is equivalent to the statement that every set can be well-ordered, i.e. that every cardinal has an initial ordinal. In this case, it is traditional to identify the cardinal number with its initial ordinal, and we say that the ...

8. Cardinality - Wikipedia

   en.wikipedia.org/wiki/Cardinality

   For each ordinal, + is the least cardinal number greater than . The cardinality of the natural numbers is denoted aleph-null ( ℵ 0 {\displaystyle \aleph _{0}} ), while the cardinality of the real numbers is denoted by " c {\displaystyle {\mathfrak {c}}} " (a lowercase fraktur script "c"), and is also referred to as the cardinality of the ...

9. Scott's trick - Wikipedia

   en.wikipedia.org/wiki/Scott's_trick

   These sets are then taken to "be" cardinal numbers, by definition. In Zermelo–Fraenkel set theory with the axiom of choice, one way of assigning representatives to cardinal numbers is to associate each cardinal number with the least ordinal number of the same cardinality. These special ordinals are the ℵ numbers. But if the axiom of choice ...