KnowraCardinal numberLinked fromLinked fromThe 10 pages that link to Cardinal number, each with the reason it gives.All 10Related 5Narrower topic 4Compared with 1Set theoryRelated: Cardinals make comparisons of finite and infinite set sizes precise.Natural numberRelated: For finite sets, natural numbers measure how many elements the set contains.Zermelo–Fraenkel set theoryRelated: ZF provides the framework for comparing and classifying set sizes.Ordinal numberCompared with: Cardinals measure how many items there are; ordinals capture how they are ordered.Felix HausdorffRelated: His set theory examined infinite cardinalities and their relationships.Large cardinalNarrower topic: Large-cardinal properties are imposed on cardinals to distinguish them from ordinary infinite sizes.Aleph numberNarrower topic: Aleph numbers are the infinite cardinals, extending this notion of set size.Schröder–Bernstein theoremRelated: The theorem supports the standard comparison of cardinal numbers through injections.Erdős–Rado theoremNarrower topic: The theorem compares sizes of infinite sets using cardinal numbers.Cardinality of the continuumNarrower topic: The continuum is a particular cardinal number, compared with others through bijections.