[HTML][HTML] Grid induced minor theorem for graphs of small degree

T Korhonen - Journal of Combinatorial Theory, Series B, 2023 - Elsevier
A graph H is an induced minor of a graph G if H can be obtained from G by vertex deletions
and edge contractions. We show that there is a function f (k, d)= O (k 10+ 2 d 5) so that if a …

Induced subgraphs and tree decompositions VII. Basic obstructions in H-free graphs

T Abrishami, B Alecu, M Chudnovsky, S Hajebi… - Journal of Combinatorial …, 2024 - Elsevier
We say a class C of graphs is clean if for every positive integer t there exists a positive
integer w (t) such that every graph in C with treewidth more than w (t) contains an induced …

Induced subgraphs and tree decompositions II. Toward walls and their line graphs in graphs of bounded degree

T Abrishami, M Chudnovsky, C Dibek, S Hajebi… - Journal of Combinatorial …, 2024 - Elsevier
This paper is motivated by the following question: what are the unavoidable induced
subgraphs of graphs with large treewidth? Aboulker et al. made a conjecture which answers …

Induced subgraphs and path decompositions

R Hickingbotham - arxiv preprint arxiv:2206.15054, 2022 - arxiv.org
A graph $ H $ is an induced subgraph of a graph $ G $ if a graph isomorphic to $ H $ can be
obtained from $ G $ by deleting vertices. Recently, there has been significant interest in …

Tree independence number I.(Even hole, diamond, pyramid)‐free graphs

T Abrishami, B Alecu, M Chudnovsky… - Journal of Graph …, 2024 - Wiley Online Library
The tree‐independence number tree‐α, first defined and studied by Dallard, Milanič, and
Štorgel, is a variant of treewidth tailored to solving the maximum independent set problem …

Treewidth versus clique number. IV. Tree-independence number of graphs excluding an induced star

C Dallard, M Krnc, O Kwon, M Milanič… - arxiv preprint arxiv …, 2024 - arxiv.org
Many recent works address the question of characterizing induced obstructions to bounded
treewidth. In 2022, Lozin and Razgon completely answered this question for graph classes …

Induced subgraphs and tree decompositions XI. Local structure in even-hole-free graphs of large treewidth

B Alecu, M Chudnovsky, S Hajebi, S Spirkl - arxiv preprint arxiv …, 2023 - arxiv.org
Treewidth is a fundamental graph parameter that quantifies the complexity of graphs by
measuring their" thickness" compared to a tree. In 1986, Robertson and Seymour proved …

Treewidth, circle graphs, and circular drawings

R Hickingbotham, F Illingworth, B Mohar… - SIAM Journal on Discrete …, 2024 - SIAM
A circle graph is an intersection graph of a set of chords of a circle. We describe the
unavoidable induced subgraphs of circle graphs with large treewidth. This includes …

Induced subgraphs and tree decompositions V. One neighbor in a hole

T Abrishami, B Alecu, M Chudnovsky… - Journal of Graph …, 2024 - Wiley Online Library
What are the unavoidable induced subgraphs of graphs with large treewidth? It is well‐
known that the answer must include a complete graph, a complete bipartite graph, all …

Induced subgraphs and tree decompositions X. Towards logarithmic treewidth for even-hole-free graphs

T Abrishami, B Alecu, M Chudnovsky, S Hajebi… - arxiv preprint arxiv …, 2023 - arxiv.org
A generalized $ t $-pyramid is a graph obtained from a certain kind of tree (a subdivided star
or a subdivided cubic caterpillar) and the line graph of a subdivided cubic caterpillar by …