In two sets A and B, for each element a in A there corresponds an element b = Φ(a) in B, and when a1 and a2 are different, the corresponding b1 = Φ( a1 ) and b2 = Φ( a2 ) are also different, and any element b in B can be written in the form Φ(a), then sets A and B are said to have a one-to-one correspondence (by the mapping Φ), and Φ is called a one-to-one correspondence between A and B. For example, if the natural number n corresponds to the even number 2n, then the set of all natural numbers and the set of all even numbers correspond one-to-one. The cardinality of two sets that have a one-to-one correspondence is equal. →Related items Actual number | Correspondence Source : Heibonsha Encyclopedia About MyPedia Information |
二つの集合A,BにおいてAの各元aに対しBの元b=Φ(a)が対応し,a1,a2が異なるとき対応するb1=Φ(a1),b2=Φ(a2)も異なり,Bの任意の元bはΦ(a)の形に書けるとき,集合A,Bは(写像Φにより)1対1に対応するといい,ΦをA,Bの間の1対1対応という。たとえば自然数nに偶数2nを対応させると,これにより自然数全体の集合と偶数全体の集合が1対1に対応する。1対1に対応する二集合の濃度は等しい。 →関連項目実数|対応 出典 株式会社平凡社百科事典マイペディアについて 情報 |
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