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可算集合
1. countable setMathematics
2. Countable setIn mathematics, a countable set is a set with the same cardinality as some subset of the set of natural numbers. A set that is not countable is called uncountable. The term was originated by Georg Cantor. The elements of a countable set can be counted one at a time—although the counting may never finish, every element of the set will eventually be associated with a natural number. Some authors use countable set to mean a set with the same cardinality as the set of natural numbers.
Read “Countable set” on English Wikipedia
Read “可算集合” on Japanese Wikipedia
Read “Countable set” on DBpedia
Read “Countable set” on English Wikipedia
Read “可算集合” on Japanese Wikipedia
Read “Countable set” on DBpedia
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