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Ordinal numbers may be written in English with numerals and letter suffixes: 1st, 2nd or 2d, 3rd or 3d, 4th, 11th, 21st, 101st, 477th, etc., with the suffix acting as an ordinal indicator. Written dates often omit the suffix, although it is nevertheless pronounced. For example: 5 November 1605 (pronounced "the fifth of November ...
Cantor called the set of finite ordinals the first number class. The second number class is the set of ordinals whose predecessors form a countably infinite set. The set of all α having countably many predecessors—that is, the set of countable ordinals—is the union of these two number classes. Cantor proved that the cardinality of the ...
Examples: 1:a klass "first grade (in elementary school)", 3:e utgåvan "third edition", but 6 november. Furthermore, suffixes can be left out if the number obviously is an ordinal number, example: 3 utg. "3rd ed". Using a full stop as an ordinal indicator is considered archaic, but still occurs in military contexts; for example: 5. komp "5th ...
Even and odd ordinals; F. Feferman–Schütte ordinal; First uncountable ordinal; Fixed-point lemma for normal functions; Fundamental sequence (set theory) K.
Regnal numbers are ordinal numbers used to distinguish among persons with the same name who held the same office. Most importantly, they are used to distinguish monarchs.An ordinal is the number placed after a monarch's regnal name to differentiate between a number of kings, queens or princes reigning the same territory with the same regnal name.
In particular, do not start a sentence with a figure, and generally use first through ninth, not 1st through 9th, for single-digit ordinals. In "suffix" forms, use two-letter suffixes: 1st, 2nd, 3rd, 4th and so on (2nd Battalion not 2d Battalion). Do not superscript (e.g. 123 rd). Do not use ordinals for dates (see MOS:BADDATE).
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The ordinals from 1st to 4th are formed irregularly: pŕvi, drúgi, trétji, četŕti. From 5th to 99th, ordinals are formed simply by declining the corresponding cardinal number as a regular adjective.