A graph in which individual nodes have no distinct identifications except through their interconnectivity. Graphs in which labels (which are most commonly numbers) are assigned to nodes are called labeled graphs. Unless indicated otherwise by context, the unmodified term "graph" generally refers to an unlabeled graph.
Unlabeled Graph
See also
Graph, Labeled Graph, Simple GraphExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Unlabeled Graph." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/UnlabeledGraph.html