It follows from the work of Tait and the Four-Color-Theorem that a planar cubic graph is 3-edge-colorable if and only if it contains no bridge. We consider the question of which planar graphs are subgraphs of planar cubic bridgeless graphs, and hence 3-edge-colorable. We provide an efficient recognition algorithm that given an n-vertex planar graph, augments this graph in 𝒪(n²) steps to a planar cubic bridgeless supergraph, or decides that no such augmentation is possible. The main tools involve the Generalized (Anti)factor-problem for the fixed embedding case, and SPQR-trees for the variable embedding case.
@InProceedings{goetze_et_al:LIPIcs.ESA.2022.62, author = {Goetze, Miriam and Jungeblut, Paul and Ueckerdt, Torsten}, title = {{Efficient Recognition of Subgraphs of Planar Cubic Bridgeless Graphs}}, booktitle = {30th Annual European Symposium on Algorithms (ESA 2022)}, pages = {62:1--62:14}, series = {Leibniz International Proceedings in Informatics (LIPIcs)}, ISBN = {978-3-95977-247-1}, ISSN = {1868-8969}, year = {2022}, volume = {244}, editor = {Chechik, Shiri and Navarro, Gonzalo and Rotenberg, Eva and Herman, Grzegorz}, publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik}, address = {Dagstuhl, Germany}, URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ESA.2022.62}, URN = {urn:nbn:de:0030-drops-170007}, doi = {10.4230/LIPIcs.ESA.2022.62}, annote = {Keywords: edge colorings, planar graphs, cubic graphs, generalized factors, SPQR-tree} }
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