bidirected graph in a sentence

1. The latter are bidirected graphs, not directed graphs ( except in the trivial case of all positive signs ).
2. For the correspondence between bidirected graphs and skew-symmetric graphs ( i . e ., their double covering graphs ) see, Section 5, or.
3. The " directed " edges are the same as ordinary directed edges in a directed graph; thus, a directed graph is a special kind of bidirected graph.
4. Skew-symmetric graphs were first introduced under the name of " antisymmetrical digraphs " by, later as the double covering graphs of polar graphs by, and still later as the double covering graphs of bidirected graphs by.
5. A closely related concept is the bidirected graph of ( " polarized graph " in the terminology of, ), a graph in which each of the two ends of each edge may be either a head or a tail, independently of the other end.
6. It's difficult to find bidirected graph in a sentence.
7. A bidirected graph may be interpreted as a polar graph by letting the partition of edges at each vertex be determined by the partition of endpoints at that vertex into heads and tails; however, swapping the roles of heads and tails at a single vertex ( " switching " the vertex, in the terminology of ) produces a different bidirected graph but the same polar graph.
8. A bidirected graph may be interpreted as a polar graph by letting the partition of edges at each vertex be determined by the partition of endpoints at that vertex into heads and tails; however, swapping the roles of heads and tails at a single vertex ( " switching " the vertex, in the terminology of ) produces a different bidirected graph but the same polar graph.