1. Regular cardinalIn set theory, a regular cardinal is a cardinal number that is equal to its own cofinality. So, crudely speaking, a regular cardinal is one which cannot be broken into a smaller collection of smaller parts. If the axiom of choice holds (so that any cardinal number can be well-ordered), an infinite cardinal is regular if and only if it cannot be expressed as the cardinal sum of a set of cardinality less than, the elements of which are cardinals less than .
Read “Regular cardinal” on English Wikipedia
Read “正則基数” on Japanese Wikipedia
Read “Regular cardinal” on DBpedia
Read “Regular cardinal” on English Wikipedia
Read “正則基数” on Japanese Wikipedia
Read “Regular cardinal” on DBpedia
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