English

Perfect matching cuts partitioning a graph into complementary subgraphs

Data Structures and Algorithms 2022-10-14 v1 Combinatorics

Abstract

In Partition Into Complementary Subgraphs (Comp-Sub) we are given a graph G=(V,E)G=(V,E), and an edge set property Π\Pi, and asked whether GG can be decomposed into two graphs, HH and its complement H\overline{H}, for some graph HH, in such a way that the edge cut [V(H),V(H)][V(H),V(\overline{H})] satisfies the property Π\Pi. Motivated by previous work, we consider Comp-Sub(Π\Pi) when the property Π=PM\Pi=\mathcal{PM} specifies that the edge cut of the decomposition is a perfect matching. We prove that Comp-Sub(PM\mathcal{PM}) is GI-hard when the graph GG is {Ck7,Ck7}\{C_{k\geq 7}, \overline{C}_{k\geq 7} \}-free. On the other hand, we show that Comp-Sub(PM\mathcal{PM}) is polynomial-time solvable on holehole-free graphs and on P5P_5-free graphs. Furthermore, we present characterizations of Comp-Sub(PM\mathcal{PM}) on chordal, distance-hereditary, and extended P4P_4-laden graphs.

Keywords

Cite

@article{arxiv.2210.06714,
  title  = {Perfect matching cuts partitioning a graph into complementary subgraphs},
  author = {Diane Castonguay and Erika M. M. Coelho and Hebert Coelho and Julliano R. Nascimento and Uéverton S. Souza},
  journal= {arXiv preprint arXiv:2210.06714},
  year   = {2022}
}
R2 v1 2026-06-28T03:30:42.701Z