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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 Core (graph theory) ： ウィキペディア英語版 Core (graph theory) In the mathematical field of graph theory, a core is a notion that describes behavior of a graph with respect to graph homomorphisms. == Definition == Graph $G$ is a core if every homomorphism $f:G\; \backslash to\; G$ is an isomorphism, that is it is a bijection of vertices of $G$. A core of a graph $H$ is a graph $G$ such that # There exists a homomorphism from $H$ to $G$, # there exists a homomorphism from $G$ to $H$, and # $G$ is minimal with this property. Two graphs are said to be homomorphism equivalent or hom-equivalent if they have isomorphic cores. 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「Core (graph theory)」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.