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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Fraïssé's theorem ： ウィキペディア英語版 Fraïssé's theorem In mathematics, Fraïssé's theorem, named after Roland Fraïssé, states that a class ''K'' of finite relational structures is the age of a countable homogeneous relational structure if and only if it satisfies the following four conditions: * ''K'' is closed under isomorphism; * ''K'' is closed under taking induced substructures; * ''K'' has only countably many members up to isomorphism; * ''K'' has the amalgamation property. If these conditions hold, then the countable homogeneous structure whose age is ''K'' is unique up to isomorphism. Fraïssé proved the theorem in the 1950s. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Fraïssé's theorem」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.