Examples of using Connected graph in English and their translations into Russian
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A strong orientation is an orientation that results in a strongly connected graph.
For any connected graph G, it is possible to construct its universal covering graph. .
The universal covering graph T of a connected graph G can be constructed as follows.
The algebraic connectivity of a graph G is greater than 0 if andonly if G is a connected graph.
A connected graph with at least two vertices has treewidth 1 if and only if it is a tree.
Based on these two results,he conjectured that in fact every connected graph with a planar cover is projective.
For a connected graph G remove every edge with probability p; this models a network subject to random edge failures.
This can be shown using the fact that a homomorphism maps a connected graph into one connected component of the target graph. .
Every connected graph is an expander; however, different connected graphs have different expansion parameters.
Sumner(1974) and, independently, Las Vergnas(1975)proved that every claw-free connected graph with an even number of vertices has a perfect matching.
As a simple example, a connected graph with diameter D will have at least D+1 distinct values in its spectrum.
Edge contraction is used in the recursive formula for the number of spanning trees of an arbitrary connected graph, and in the recurrence formula for the chromatic polynomial of a simple graph. .
Any connected graph may be transformed into a factor-critical graph by contracting sufficiently many of its edges.
According with the graph theory(Picard, 1980),a questionnaire can be represented as a connected graph, where the vertices are the variables and the answers define the edges.
A connected graph is said to be[math]k[/math]-edge-connected if it remains connected after removal any[math]k-1[/math] of its edges.
Is then a chain decomposition of G. The following characterizations then allow to read off several properties of G from C efficiently,including all bridges of G. Let C be a chain decomposition of a simple connected graph G=V, E.
Negami(1986) proved, conversely, that if a connected graph H has a two-ply planar cover then H must have an embedding into the projective plane.
Every connected graph in which the domination number is half the number of vertices arises in this way, with the exception of the four-vertex cycle graph. .
If G is a tree,then G itself is the universal covering graph of G. For any other finite connected graph G, the universal covering graph of G is a countably infinite(but locally finite) tree.
Winkler showed that a connected graph is a partial cube if and only if it is bipartite and the relation Θ{\displaystyle\Theta} is transitive.
Cameron, Edmonds& Lovász(1986) proved that,if the edges of a complete graph are partitioned into three subgraphs in such a way that every three vertices induce a connected graph in one of the three subgraphs, and if two of the subgraphs are perfect, then the third subgraph is also perfect.
If a connected graph with three or more vertices has maximum degree three, then its cutwidth equals the vertex separation number of its line graph. .
A chain of length k(k≥ 0)is a connected graph whose vertices can be numbered with integers from 1 to k+ 1 so that the edges of the graph connect all pairs of vertices(i, i+ 1)(1≤i≤k) and only them.
If a connected graph is 2k-regular and has an even number of edges it may also be k-factored, by choosing each of the two factors to be an alternating subset of the edges of an Euler tour.
The resistance distance between two vertices of a simple connected graph, G, is equal to the resistance between two equivalent points on an electrical network, constructed so as to correspond to G, with each edge being replaced by a 1 ohm resistance.
If a connected graph is a Cartesian product, it can be factorized uniquely as a product of prime factors, graphs that cannot themselves be decomposed as products of graphs. .
Conversely, if a partition with this property exists for a strongly connected graph G, k must divide the lengths of all cycles in G. Thus, we may find the period of a strongly connected graph G by the following steps: Perform a depth-first search of G For each e in G that connects a vertex on level i of the depth-first search tree to a vertex on level j, let ke j- i- 1.
A connected graph G, with designated vertices s and t, has a bipolar orientation and an st-numbering if and only if the graph formed from G by adding an edge from s to t is 2-vertex-connected.
A connected graph is said to be[math]k[/math]-vertex-connected(or simply[math]k[/math]-connected) if it has more than[math]k[/math] vertices and remains connected after removal any[math]k-1[/math] of its vertices.
When a connected graph does not meet the conditions of Euler's theorem, a closed walk of minimum length covering each edge at least once can nevertheless be found in polynomial time by solving the route inspection problem.