Let o(H) be the order of the smallest colour class in any proper x(H)-colouring of H. Pro G20(H) for a graph G, then r(G, H) 2 (G|-1)(x(H)-1)+o(H).
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- Find two groups of order 6 that are not isomorphic.Prove : for r belongs to Z+, every r connected graph on an even number of vertices with no induced subgraph isomorphic to k1,r+1 has a 1-factor. Show that this is not true if you replace r connected by r edge connectedSuppose that G is an r-regular graph of order n such that both G and its complement G are connected. Is it possible that neither G nor G is Eulerian?
- Let G be a connected graph of order n = 4 and let k be an integer with 2 ≤ k ≤ n − 2. a)Prove that if G is not k-connected, then G contains a vertex-cut U with |U| = k − 1? b) if G is not k-edge-connected, then G contains an edge-cut X with |X| = k − 1Let G be a simple graph. Show that the relation R on theset of vertices of G such that uRv if and only if there isan edge associated to {u, v} is a symmetric, irreflexiverelation on G.Let G be a connected graph of order n = 4 and let k be an integer with 2 ≤ k ≤ n − 2. Prove that if G is not k-connected, then G contains a vertex-cut U with |U| = k − 1 and if it is not k-edge-connected, then G contains an edge-cut X with |X| = k − 1
- Determine the largest positive integer k such that χ(H) = χ(G) = k, where H is obtained from a nonempty graph G by subdividing each edge of G exactly once.Let G be a graph with n ≥ 3 vertices that has a clique of size n − 2 but no cliques of size n − 1.Prove that G has two distinct independent sets of size 2. Show your work and complete proof.Let G be a connected graph with at least one edge and F ⊆ E(G) be an edge cut. Prove that F is a minimal edge cut if and only if G − F contains exactly two connected components.
- Give an upper bound on the number e of edges of G in terms of n and g if G is a connected plane graph with n vertices and girth g.Let G be a graph of order n and let k be an integer with 1≤k≤n−1.Prove that if every vertice of G such that deg(v)≥(n+ k − 2)/2, then G is k-connected.16. Let G be a graph with n vertices , t of which have degree K and the others have degree K+1 ,prove that t = (K+1)n-2e , e is number of edges in G .