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Questions about the branch of combinatorics called graph theory (not to be used for questions concerning the graph of a function). This tag can be further specialized via using it in combination with more specialized tags such as extremal-graph-theory, spectral-graph-theory, algebraic-graph-theory, topological-graph-theory, random-graphs, graph-colorings and several others.

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Proof of edge-order inequality [closed]

I was just going through a past exam paper for my intro graphs module and the following question came up, and I can't find any notes on it: Let G = (V,E) be a simple graph. Show that: $2|E| \leq |V| …
Chris Mowforth's user avatar