Adjacent Vertices
In a graph G, two graph vertices are adjacent if they are joined by a graph edge.
See also
Graph, Graph Edge, Graph VertexExplore with Wolfram|Alpha
WolframAlpha
Cite this as:
Weisstein, Eric W. "Adjacent Vertices." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/AdjacentVertices.html