Примеры использования Induced subgraph на Английском языке и их переводы на Русский язык
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Any induced subgraph of a bipartite graph remains bipartite.
A cograph is a graph in which every connected induced subgraph has a disconnected complement.
Thus, any induced subgraph inherits the distances of the larger graph.
A perfect graph is a graph in which the clique number equals the chromatic number in every induced subgraph.
A cograph is a graph in which every nontrivial induced subgraph has at least two vertices with the same neighbourhoods.
Removing the vertices of an odd cycle transversal from a graph leaves a bipartite graph as the remaining induced subgraph.
An undirected graph is perfect if, in every induced subgraph, the chromatic number equals the size of the largest clique.
If the input graph is not a Helly circular-arc graph,then the algorithm returns a certificate of this fact in the form of a forbidden induced subgraph.
Any induced subgraph of a comparability graph is itself a comparability graph, formed from the restriction of the partial order to a subset of its elements.
Perfectly orderable graphs, the graphs that can be ordered in such a way that a greedy coloring algorithm is optimal on every induced subgraph.
It is easy to see thatbipartite graphs are perfect: in any nontrivial induced subgraph, the clique number and chromatic number are both two and therefore both equal.
A perfect graph is a graph in which the chromatic number and the size of the maximum clique are equal, andin which this equality persists in every induced subgraph.
The degeneracy of a graph G was defined by Lick& White(1970)as the least k such that every induced subgraph of G contains a vertex with k or fewer neighbors.
A graph is said to be maximal-clique irreducible if every maximal clique has an edge that belongs to no other maximal clique, andhereditary maximal-clique irreducible if the same property is true for every induced subgraph.
It is NP-hard, as a special case of the problem of finding the largest induced subgraph with a hereditary property as the property of being bipartite is hereditary.
In graph theory, a perfectly orderable graph is a graph whose vertices can be ordered in such a way that a greedy coloring algorithm with that ordering optimally colors every induced subgraph of the given graph.
Thus, if a subfamily of the cographs(such as the planar cographs)is closed under induced subgraph operations then it has a finite number of forbidden induced subgraphs. .
Suppose that the problem is closed under induced subgraphs(if a solution of size≤ k exists in a given graph, then a solution of this size orsmaller also exists in every induced subgraph) and that there exists an efficient subroutine that determines whether a solution Y of size k+ 1 can be compressed to a smaller solution of size k.
Line graphs of trees have been used to find graphs with a given number of edges andvertices in which the largest induced subgraph that is a tree is as small as possible.
Given a simple graph G(V, E),the set of triples of the vertex set V whose induced subgraph has an odd number of edges forms a two-graph on the set V. Every two-graph can be represented in this way.
The graph is both chordal(every cycle of length greater than three has a diagonal) anddistance-hereditary every connected induced subgraph has the same distances as the whole graph.
Perfect graphs may also be described as the graphs in which, in every induced subgraph, the size of the largest independent set is equal to the number of cliques in a partition of the graph's vertices into a minimum number of cliques.
The same technique can be applied to finding sets of edges for graph properties closed under subgraphs(rather than induced subgraph), or for other properties beyond graph theory.
Based on the characterization of cographs as the graphs without induced subgraph isomorphic to a chordless path with four vertices, the clique-width of many graph classes defined by forbidden induced subgraphs has been classified.
Perfect matchings may be used to provide another characterization of the claw-free graphs:they are exactly the graphs in which every connected induced subgraph of even order has a perfect matching.
Thus, perfection(defined as the equality of maximum clique size andchromatic number in every induced subgraph) is equivalent to the equality of maximum independent set size and clique cover number.
In graph theory, a branch of discrete mathematics, a distance-hereditary graph(also called a completely separable graph)is a graph in which the distances in any connected induced subgraph are the same as they are in the original graph.
More formally, a graph G is said to be perfectly orderable if there exists an ordering π of the vertices of G, such that every induced subgraph of G is optimally colored by the greedy algorithm using the subsequence of π induced by the vertices of the subgraph. .
As with any bipartite graph,the Herschel graph is a perfect graph: the chromatic number of every induced subgraph equals the size of the largest clique of that subgraph. .
The problem of finding the smallest odd cycle transversal, orequivalently the largest bipartite induced subgraph, is also called odd cycle transversal, and abbreviated as OCT.