Let G be a 3-connected planar graph with n vertices and let p(G) be the maximum number of vertices of an induced subgraph of G that is a path. We prove that p(G) ≥ log n/12 log log n. To demonstrate the tightness of this bound, we notice that the above inequality implies p(G) ∈ Ω((log2 n)1-ε ), where ε is any positive constant smaller than 1, and describe an infinite family of 3-connected planar graphs for which p(G) ∈ O(log n). As a byproduct of our research, we prove a result of independent interest: Every 3-connected planar graph with n vertices contains an induced subgraph that is outerplanar and connected and that contains at least 3√n vertices. The proofs in the paper are constructive and give rise to O(n)-time algorithms. © 2013 Springer-Verlag.
CITATION STYLE
Di Giacomo, E., Liotta, G., & McHedlidze, T. (2013). Lower and upper bounds for long induced paths in 3-connected planar graphs. In Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) (Vol. 8165 LNCS, pp. 213–224). Springer Verlag. https://doi.org/10.1007/978-3-642-45043-3_19
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