An graph edge of a graph is separating if a path from a point 
to a point 
must pass over it. Separating graph
edges can therefore be viewed as either bridges or dead ends.
Separating Edge
See also
Graph EdgeExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Separating Edge." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/SeparatingEdge.html