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Let G be the graph obtained by removing an edge from the complete graph K By...
4. Let G be a simple graph having at least one edge, and let L(G) be its line graph. (a) Show that x'(G) = x(L(G)). (b) Assume that the highest vertex degree in G is 3. Using the above, show Vizing's Theorem for G. You may use any theorem from class involving the chromatic number, but no theorem involving the chro- matic index.
Let G be a graph, and let T, T' be spanning trees in G. Show that if e is an edge in T, then there is an edge e in T' such that the graph obtained by adding the edge e, to T-e is again a spanning tree in G.
Let G be a graph, and let T, T' be spanning trees in G. Show that if e is an edge in T, then there is an edge e in...
2. (a) Let G be a connected non-complete graph with order n 2 3 and diameter d. Prove that the connectivity K(G) of G satisfies d-1 (b) A connected graph is called unicyclic if it contains exactly one cycle. Prove that the edge-connectivity of any unicyclic graph is at most 2.
2. (a) Let G be a connected non-complete graph with order n 2 3 and diameter d. Prove that the connectivity K(G) of G satisfies d-1 (b) A connected...
6. Prove that the following graphs are connected: (a) The 3 vertex cycle: (b) The following 4 vertex graph: (c) K 7. An edge e of a connected graph G is called a cut edge if the graph G obtained by deleting that edge (V(G) V(G) and E(G) E(G) \<ej) is not connected. Prove that if G1 and G2 are connected simple graphs which are isomorphic and if G1 has a cut edge, then G2 also has a cut edge....
Question 1# (a) Let G be a connected graph and C a non-trivial circuit in G. Prove directly that if an edge e fa, b is removed from C then the subgraph S C G that remains is still connected. "Directly' means using only the definitions of the concepts involved, in this case connected' and 'circuit'. Hint: If z and y are vertices of G connected by path that includes e, is there an alternative path connecting x to y...
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3. (10 points) Let G be an undirected graph with nodes vi,..Vn. The adja.- cency matriz representation for G is the nx n matrix M given by: Mij-1 if there is an edge from v, to ty. and M,',-0 otherwise. A triangle is a set fvi, vjof 3 distinct vertices so that there is an edge from v, to vj, another from v to k and a third from vk to v. Give and analyze...
need help with a and b in this graph theory question
Let n >k> 1 with n even and k odd. Make a k-regular graph G by putting n vertices in a circle and connecting each vertex to the exact a) Show that for all u,v there are k internally disjoint u, v-paths (you (b) Use the previous part, even if you did not prove it, to show that the e vertex and the k 1 closest vertices on either...
please give me the complete prove for this question;
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7. For a graph G of order n 2, define the k-connectivity Kk(G) of G (2 S k n) as the minimum number of vertices whose removal from G results in a graph with at least k components or a graph of order less than k. (Therefore, K2(G) = K(G).) A graph G is defined to be (f,k)- connected if Kk(G) . Let G be a graph of order...
er (a) Let G be a connected graph and C a non-trivial circuit in G. Prove directly that if an edge ={a, b} is removed from then the subgraph S CG that remains is still connected. Directly' means using only the definitions of the concepts involved, in this case 'connected' and 'circuit'. Hint: If r and y are vertices of G connected by path that includes e, is there an alternative path connecting x to y that avoids e? (b)...
3. Let G be an undirected graph in which the degree of every vertex is at least k. Show that there exist two vertices s and t with at least k edge-disjoint paths between them.
3. Let G be an undirected graph in which the degree of every vertex is at least k. Show that there exist two vertices s and t with at least k edge-disjoint paths between them.