cofinal subclass

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Reflection principle — This article is about the reflection principles in set theory. For the reflection principle of complex analysis, see Schwarz reflection principleIn set theory, a branch of mathematics, a reflection principle says that it is possible to find sets… … Wikipedia
Ordinal number — This article is about the mathematical concept. For number words denoting a position in a sequence ( first , second , third , etc.), see Ordinal number (linguistics). Representation of the ordinal numbers up to ωω. Each turn of the spiral… … Wikipedia
Bounded set — In mathematical analysis and related areas of mathematics, a set is called bounded, if it is, in a certain sense, of finite size. Conversely a set which is not bounded is called unbounded. Definition A set S of real numbers is called bounded from … Wikipedia

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