Примеры использования Induced subgraphs на Английском языке и их переводы на Русский язык
{-}
-
Official
-
Colloquial
A cograph is a graph all of whose connected induced subgraphs have diameter at most 2.
The graphs with tree-depth at most d themselves also have a finite set of forbidden induced subgraphs.
They are the graphs with the property that in each of its induced subgraphs the clique number equals the pseudo-Grundy number.
The same neighbourhood notation may also be used to refer to sets of adjacent vertices rather than the corresponding induced subgraphs.
A graph is strongly chordal if and only if each of its induced subgraphs is a dually chordal graph.
The split comparability graphs, and therefore also the split interval graphs,can be characterized in terms of a set of three forbidden induced subgraphs.
They are the graphs with the property that in each of its induced subgraphs the chromatic number equals the pseudo-Grundy number.
The difficulty in finding a characterization of linear k-uniform hypergraphs is due to the fact that there are infinitely many forbidden induced subgraphs.
Cliques and independent sets are induced subgraphs that are respectively complete graphs or edgeless graphs.
As the strong perfect graph theorem states, the odd holes andodd antiholes turn out to be the minimal forbidden induced subgraphs for the perfect graphs.
They are the graphs with the property that in each of its induced subgraphs the clique cover number equals the number of maximal cliques.
Cographs can be characterized as graphs in which every maximal clique intersects every maximal independent set, andin which the same property is true in all induced subgraphs.
The degeneracy of a graph is the maximum, over all induced subgraphs of the graph, of the minimum degree of a vertex in the subgraph. .
A graph is called domination perfect if it has a minimum dominating set that is independent, andif the same property holds in all of its induced subgraphs.
A cograph is a graph all of whose induced subgraphs have the property that any maximal clique intersects any maximal independent set in a single vertex.
An equivalent statement to the original conjecture is that, for every graph H{\displaystyle H},the H{\displaystyle H}-free graphs all contain polynomially large perfect induced subgraphs.
In graph theory, a trivially perfect graph is a graph with the property that in each of its induced subgraphs the size of the maximum independent set equals the number of maximal cliques.
The perfectly orderable graphs are defined to be the graphs for which there is an ordering that is optimal for the greedy algorithm not just for the graph itself, but for all of its induced subgraphs.
A graph is strongly chordal if and only if every one of its induced subgraphs has a simple vertex, a vertex whose neighbors have neighborhoods that are linearly ordered by inclusion.
In graph theory, the Henson graph Gi is an undirected infinite graph, the unique countable homogeneous graph that does not containan i-vertex clique but that does contain all Ki-free finite graphs as induced subgraphs.
Then, by applying the extension property twice,one can find isomorphic induced subgraphs Gi+ 1 and Hi+ 1 that include gi and hi together with all the vertices of the previous subgraphs. .
This result had been conjectured by Berge(1961, 1963), andit is sometimes called the weak perfect graph theorem to distinguish it from the strong perfect graph theorem characterizing perfect graphs by their forbidden induced subgraphs.
A perfect graph is an undirected graph with the property that, in every one of its induced subgraphs, the size of the largest clique equals the minimum number of colors in a coloring of the subgraph. .
No characterization by forbidden induced subgraphs is known of line graphs of k-uniform hypergraphs for any k≥ 3, and Lovász(1977) showed there is no such characterization by a finite list if k 3.
It is now known(the strong perfect graph theorem)that perfect graphs may be characterized as the graphs that do not have as induced subgraphs either an odd cycle or the complement of an odd cycle a so-called odd hole.
If a graph family F is closed under the operation of taking induced subgraphs, then every graph in F is also locally F. For instance, every chordal graph is locally chordal; every perfect graph is locally perfect; every comparability graph is locally comparable.
These include the bipartite graphs, the chordal graphs, the comparability graphs,the distance-hereditary graphs(in which shortest path distances in connected induced subgraphs equal those in the whole graph), and the wheel graphs that have an odd number of vertices.
He observed that perfect graphs cannot contain odd antiholes, induced subgraphs complementary to odd holes: an odd antihole with 2k+ 1 vertices has clique number k and chromatic number k+ 1, again impossible for a perfect graphs.
The family of chordal graphs may be defined inductively as the graphs whose vertices can be divided into three nonempty subsets A, S, and B, such that A∪ S andS∪ B both form chordal induced subgraphs, S is a clique, and there are no edges from A to B. That is, they are the graphs that have a recursive decomposition by clique separators into smaller subgraphs. .
Unlike for chordal graphs, the property of being dually chordal is not hereditary,i.e., induced subgraphs of a dually chordal graph are not necessarily dually chordal(hereditarily dually chordal graphs are exactly the strongly chordal graphs), and a dually chordal graph is in general not a perfect graph.