Also called countable numbering. The smallest of the infinite set numbers. If there is a one-to-one correspondence between every element of an infinite set and the set of natural numbers {1, 2, 3, …}, then the set is said to be countable. When a set is countable, it is called a countable set. In other words, a set whose elements can be represented as a sequence such as { a 1 , a 2 , a 3 , …, a n , …}. For example, the set of all rational numbers is a countable set. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
可付番ともいう。無限の集合数のうち最小のもの。無限集合のすべての元と自然数の集合{1,2,3,…}との間に一対一対応がつけられれば,この集合は可算であるという。集合が可算であるとき,可算集合という。これは別の言葉でいえば,その集合の元を{ a1 ,a2 ,a3 ,…,an ,…}のように列に並べた形で表示できる集合ということになる。たとえば,有理数全体の集合は可算集合である。
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