2026-09-18T02:43:11Z https://drops.dagstuhl.de/oai

oai:drops-oai.dagstuhl.de:24246 2026-09-05T18:39:34Z ddc:004 open_access

Enumerating Minimal Dominating Sets and Variants in Chordal Bipartite Graphs Castelo, Emanuel Defrain, Oscar C. M. Gomes, Guilherme algorithmic enumeration minimal dominating sets connected dominating sets total dominating sets chordal bipartite graphs sequential method polynomial delay Enumerating minimal dominating sets with polynomial delay in bipartite graphs is a long-standing open problem. To date, even the subcase of chordal bipartite graphs is open, with the best known algorithm due to Golovach, Heggernes, Kanté, Kratsch, Sæther, and Villanger running in incremental-polynomial time. We improve on this result by providing a polynomial delay and space algorithm enumerating minimal dominating sets in chordal bipartite graphs. Additionally, we show that the total and connected variants admit polynomial and incremental-polynomial delay algorithms, respectively, within the same class. This provides an alternative proof of a result by Golovach et al. for total dominating sets, and answers an open question for the connected variant. Finally, we give evidence that the techniques used in this paper cannot be generalized to bipartite graphs for (total) minimal dominating sets, unless P = NP, and show that enumerating minimal connected dominating sets in bipartite graphs is harder than enumerating minimal transversals in general hypergraphs. Schloss Dagstuhl – Leibniz-Zentrum für Informatik Emanuel Castelo and Oscar Defrain and Guilherme C. M. Gomes 2025 Is Part Of LIPIcs, Volume 349, 19th International Symposium on Algorithms and Data Structures (WADS 2025) InProceedings Text doc-type:ResearchArticle publishedVersion application/pdf doi:10.4230/LIPIcs.WADS.2025.15 urn:nbn:de:0030-drops-242467 https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.WADS.2025.15 eng https://creativecommons.org/licenses/by/4.0/legalcode