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graph theory
In mathematics and computer science, graph theory is the study of ''graphs'', which are mathematical structures used to model pairwise relations between objects. A graph in this context is made up of ''vertices'' or ''nodes'' or ''points'' and ''edges'' or ''arcs'' or ''lines'' that connect them. A graph may be ''undirected'', meaning that there is no distinction between the two vertices associated with each edge, or its edges may be ''directed'' from one vertex to another; see Graph (mathematics) for more detailed definitions and for other variations in the types of graph that are commonly considered. Graphs are one of the prime objects of study in discrete mathematics.
Refer to the glossary of graph theory for basic definitions in graph theory.
==Definitions==
Definitions in graph theory vary. The following are some of the more basic ways of defining graphs and related mathematical structures.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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