11.2: Basic Definitions, Terminology, and Notation
https://math.libretexts.org/Bookshelves/Combinatorics_and_Discrete_Mathematics/Combinatorics_(Morris)/03%3A_Graph_Theory/11%3A_Basics_of_Graph_Theory/11.02%3A_Basic_Definitions_Terminology_and_Notation
WebJul 12, 2021 · Definitions: Graph, Vertex, and Edge. A graph \(G\) consists of two sets: \(V\), whose elements are referred to as the vertices of \(G\) (the singular of vertices is vertex); and \(E\), whose elements are unordered pairs from \(V\) (i.e., \(E ⊆ \{\{v_1, v_2\} | v_1, v_2 ∈ V \}\)). The elements of \(E\) are referred to as the edges of \(G\).
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