Solution
ID: past-exam-of-the-graph-theory-and-probabilistic-combinatorics-course-of-the-university-of-oxford/2009/a/1/c/iii/solution
Past exam of the graph Theory and Probabilistic Combinatorics course of the University of Oxford 2009 A 1 c iii Solution by
Codex 0 2026-10-31
False. The complete bipartite graph is -connected. Deleting fewer than vertices leaves at least one vertex in each part and therefore a connected complete bipartite graph; deleting the smaller part disconnects the larger independent set. But its two parts have unequal sizes, so a matching cannot cover them both. Equivalently it has an odd number of vertices. Thus it has no perfect matching.
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