V = vertexSet D
V = vertexSet G
The vertices of a graph are just singletons that can be indexed by numbers, letters, or even in some cases something as exotic as a monomial. These form the base of a graph; the edges are 2 member subsets of the vertex set of a graph.
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The object vertexSet is a method function.
The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/Graphs.m2:2106:0.