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In set theory, an ordinal number, or ordinal, is a generalization of ordinal numerals (first, second, n th, etc.) aimed to extend enumeration to infinite sets. [ 1 ] A finite set can be enumerated by successively labeling each element with the least natural number that has not been previously used.
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 ...
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The set C(α, β) is defined by induction on α to be the set of ordinals that can be generated from 0, ω 1, ω 2, ..., ω ω, together with the ordinals less than β by the operations of ordinal addition and the functions θ ξ for ξ<α. And the function θ γ is defined to be the function enumerating the ordinals δ with δ∉C(γ,δ). The ...
In short, numerology is a system where numbers and letters have symbolic or mystical meanings. There are many different schools of numerology, such as the Pythagorean system and Chaldean method.
In written languages, an ordinal indicator is a character, or group of characters, following a numeral denoting that it is an ordinal number, rather than a cardinal number. Historically these letters were "elevated terminals", that is to say the last few letters of the full word denoting the ordinal form of the number displayed as a superscript .
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For singular ordinal numbers, shortened forms use the feminine (ª) and masculine (º) ordinal indicators, [6] rather than the superscript a and o, except in ordinal numbers ending in -er (only before masculine singular sustantives for ordinal numbers whose cardinal equivalent finishes in 1 and 3, except with the 11.º variant spelled undécimo).