Examples of using Every graph in English and their translations into Russian
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Every graph has a weak 2-coloring.
As this example shows, not every graph with a planar cover is itself planar.
Every graph has an acyclic orientation.
It is hypohamiltonian, which means that it does not itself have a Hamiltonian cycle but every graph formed by removing a single vertex from it is Hamiltonian.
In particular, every graph Mi for i≥ 2 is factor-critical.
Specifically, define a family F of graphs to have bounded pathwidth if there exists a constant p such that every graph in F has pathwidth at most pp.
That is, every graph has either a small separator or a haven of high order.
The Erdős-Hajnal conjecture that in a family of graphs defined by an excluded induced subgraph, every graph has either a large clique or a large independent set.
Every graph can be represented as an intersection graph in this way.
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.
Every graph has a cycle basis in which every cycle is an induced cycle.
Because the problem of testing whether a graph is class 1 is NP-complete,there is no known polynomial time algorithm for edge-coloring every graph with an optimal number of colors.
However, every graph on a countable set of vertices does have a normal spanning tree.
Arc diagrams were used by Brandes(1999) to visualize the state diagram of a shift register, and by Djidjev& Vrt'o(2002)to show that the crossing number of every graph is at least quadratic in its cutwidth.
Thus every graph on n vertices with more than n- 1 edges must contain a cycle.
The theorem claims that for any finite number kthere is an appropriate(least) value f(k), with the property that in every graph with no k vertex-disjoint circuits all circuits can be covered by f(k) vertices.
Therefore, every graph with book thickness two is automatically a planar graph. .
For this reason, a convenient andsymmetric reformulation of the Erdős-Hajnal conjecture is that for every graph H{\displaystyle H}, the H{\displaystyle H}-free graphs necessarily contain an induced perfect subgraph of polynomial size.
Every graph with Hadwiger number k has at most n2O(k log log k) cliques complete subgraphs.
Specifically, they conjectured that there exists a function f such that, for every graph G and for the graph H formed by replacing every edge in G by a two-edge path, if the book thickness of H is t then the book thickness of G is at most ft.
Every graph that is both a cograph and a split graph is a threshold graph. .
Moving from individual graphs to graph families,if a family of graphs has the property that every subgraph of a graph in the family is also in the family, and every graph in the family has at most as many edges as vertices, then the family contains only pseudoforests.
It is also true that every graph with n vertices has intersection number at most n2/4.
The De Bruijn-Erdős theorem may also be used to answer a question of Fred Galvin concerning an intermediate value theorem for graph chromatic numbers: for every two finite numbers j<k, and every graph G with chromatic number k, there is a subgraph of G with chromatic number j.
Every graph and every directed graph contains its core as a retract and as an induced subgraph.
The Petersen family then consists of every graph that can be reached from the Petersen graph by a combination of Δ-Y and Y-Δ transforms.
Every graph contains at most 3n/3 maximal independent sets, but many graphs have far fewer.
However, Grohe andMarx also showed that every graph of treewidth k has a bramble of polynomial size and of order Ω( k 1/ 2/ log 2 k){\displaystyle\Omega k^{1/2}/\log^{2}k.
Every graph G has exactly| χ G(- 1)|{\displaystyle|\chi_{G}(-1)|} different acyclic orientations, so in this sense an acyclic orientation can be interpreted as a coloring with -1 colors.
If κ is a strongly compact cardinal, then for every graph G and cardinal number μ< κ, G has chromatic number at most μ if and only if each of its subgraphs of cardinality less than κ has chromatic number at most μ.