
We prove that for every graph $G$ with $n$ vertices, the treewidth of $G$ plus the treewidth of the complement of $G$ is at least $n-2$. This bound is tight.
FOS: Computer and information sciences, Extremal problems in graph theory, Distance in graphs, Discrete Mathematics (cs.DM), Trees, Theoretical Computer Science, Computational Theory and Mathematics, Edge subsets with special properties (factorization, matching, partitioning, covering and packing, etc.), FOS: Mathematics, Théorie des graphes, Mathematics - Combinatorics, Geometry and Topology, Combinatorics (math.CO), Computer Science - Discrete Mathematics
FOS: Computer and information sciences, Extremal problems in graph theory, Distance in graphs, Discrete Mathematics (cs.DM), Trees, Theoretical Computer Science, Computational Theory and Mathematics, Edge subsets with special properties (factorization, matching, partitioning, covering and packing, etc.), FOS: Mathematics, Théorie des graphes, Mathematics - Combinatorics, Geometry and Topology, Combinatorics (math.CO), Computer Science - Discrete Mathematics
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