Chapter 11: Problem 10
Give an example of a connected graph \(G\) where removing any edge of \(G\) results in a disconnected graph.
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Chapter 11: Problem 10
Give an example of a connected graph \(G\) where removing any edge of \(G\) results in a disconnected graph.
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Let \(G=(V, E)\) be a connected undirected graph. a) What is the largest possible value for \(|V|\) if \(|E|=19\) and \(\operatorname{deg}(v) \geq 4\) for all \(v \in V\) ? b) Draw a graph to demonstrate each possible case in part (a).
Show that when any edge is removed from \(K_{5}\), the resulting subgraph is planar. Is this true for the graph \(K_{3,3}\) ?
Let \(G=(V, E)\) be an undirected connected loop-free graph. Suppose further that \(G\) is planar and determines 53 regions. If, for some planar embedding of \(G\), each region has at least five edges in its boundary, prove that \(|V| \geq 82\).
a) How many vertices and how many edges are there in the complete bipartite graphs \(K_{4,7}, K_{7,11}\), and \(K_{m, n}\) where \(m, n \in \mathbf{Z}^{+}\)? b) If the graph \(K_{m, 12}\) has 72 edges, what is \(m\) ?
a) How many subgraphs \(H=(V, E)\) of \(K_{6}\) satisfy \(|V|=3 ?\) (If two subgraphs are isomorphic but have different vertex sets, consider them distinct.) b) How many subgraphs \(H=(V, E)\) of \(K_{6}\) satisfy \(|V|=4 ?\) c) How many subgraphs does \(K_{6}\) have?
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