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A simple application of ordinal parity is the idempotence law for cardinal addition (given the well-ordering theorem). Given an infinite cardinal κ, or generally any limit ordinal κ, κ is order-isomorphic to both its subset of even ordinals and its subset of odd ordinals. Hence one has the cardinal sum κ + κ = κ. [2] [7]
Fundamental sequences arise in some settings of definitions of large countable ordinals, definitions of hierarchies of fast-growing functions, and proof theory.Bachmann defined a hierarchy of functions in 1950, providing a system of names for ordinals up to what is now known as the Bachmann–Howard ordinal, by defining fundamental sequences for namable ordinals below . [9]
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.
Print/export Download as PDF; Printable version; In other projects ... In mathematics, the Veblen ordinal is either of two large countable ordinals: The small Veblen ...
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 year; Regnal ordinal – Ordinal numbers used to distinguish among persons with the same name who held the same office
These include the representation via von Neumann ordinals, commonly employed in axiomatic set theory, and a system based on equinumerosity that was proposed by Gottlob Frege and by Bertrand Russell. Definition as von Neumann ordinals
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For an ordinal α, θ α is a function mapping ordinals to ordinals. Often θ α (β) is written as θαβ. 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.
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