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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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2 answers
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Need tight lower bound for independence number of order 10 graph

The independence number of a graph is the cardinality of a maximum set of vertices which are pairwise non-adjacent. It is an NP-hard graph invariant. There are a variety of ways to efficiently reduce …
Craig Larson's user avatar