In directed graphs, relationships are asymmetric and these asymmetries contain essential structural information about the graph. Directed relationships lead to a new type of clustering that is not ...

A graph G (V,E) is a finite, nonempty set of vertices, V, or nodes and a set of edges, E. If the edges E that have the form of (a,b) are ordered pairs of vertices, then we have a directed graph. If ...

Euler observed that the only relevant information here are the land masses (the nodes) and the connections between them (the bridges, or edges), which reduces the problem to a simple graph.