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A semicomplete digraph is a quasi-transitive digraph. There are extensions of quasi-transitive digraphs called k-quasi-transitive digraphs. [5] Oriented graphs are directed graphs having no opposite pairs of directed edges (i.e. at most one of (x, y) and (y, x) may be arrows of the graph).
The directed graph (or digraph) on the right is an orientation of the undirected graph on the left. In graph theory, an orientation of an undirected graph is an assignment of a direction to each edge, turning the initial graph into a directed graph.
A directed graph or digraph is a graph in which edges have orientations. In one restricted but very common sense of the term, [ 5 ] a directed graph is an ordered pair G = ( V , E ) {\displaystyle G=(V,E)} comprising:
A graph with three vertices and three edges. A graph (sometimes called an undirected graph to distinguish it from a directed graph, or a simple graph to distinguish it from a multigraph) [4] [5] is a pair G = (V, E), where V is a set whose elements are called vertices (singular: vertex), and E is a set of unordered pairs {,} of vertices, whose elements are called edges (sometimes links or lines).
A signed digraph is a directed graph with signed arcs. Signed digraphs are far more complicated than signed graphs, because only the signs of directed cycles are significant. For instance, there are several definitions of balance, each of which is hard to characterize, in strong contrast with the situation for signed undirected graphs.
Digraphs: Infinite families of non-reconstructible digraphs are known, including tournaments (Stockmeyer [13]) and non-tournaments (Stockmeyer [14]). A tournament is reconstructible if it is not strongly connected. [15] A weaker version of the reconstruction conjecture has been conjectured for digraphs, see new digraph reconstruction conjecture.