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Lior Gishboliner

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Preprint Sep 2026

NP-Hardness of the $H$-Free Edge-Deletion Problem

For a graph $H$, the $H$-freeness edge-deletion problem is the algorithmic problem of finding, for an input graph $G$, the minimum number of edges of $G$ whose deletion turns $G$ into an $H$-free graph. We show that for every graph $H$ containing a cycle, this problem is NP-hard. This proves a conjecture of Gishboliner...

Lior Gishboliner, E. Honest · 1 citation
Preprint Sep 2026

Upper bounds for ordered Ramsey numbers of forests and bounded-degree graphs

We prove the following two upper bounds for ordered Ramsey numbers: (1) Every ordered forest $F$ on $n$ vertices satisfies $R_{<}(F,F)=O(n^{1+\lceil\log\chi_{<}(F)\rceil})$. This in particular answers a question of Geneson, Holmes, Liu, Neidinger, Pehova and Wass. (2) There is a function $f$ such that, for every fixed...

Lior Gishboliner, Xiang-Yu Li · 0 citations
Preprint Sep 2026

Proof of the Pach-Tardos conjecture

We prove that for every acyclic matrix pattern $P$ it holds that $\operatorname{Ex}(n,P) \leq n^{1+O_P(1/\log\log n)}$.

Lior Gishboliner, Xiang-Yu Li · 0 citations
Preprint Aug 2026

Homomorphism and VC-dimension thresholds: spectra and separations

Minimum-degree thresholds ask when excluding a fixed graph $H$ forces a dense graph to admit a simple global description. For each fixed chromatic number, the chromatic threshold has only three possible values. We show that this finite-spectrum phenomenon is special to chromatic threshold: already among $3$-chromatic g...

Lior Gishboliner, Xin-Qi Huang, Hong Liu · 1 citation
Open access Feb 2025

Asymmetric Results About Graph Homomorphisms

Many important results in extremal graph theory can be roughly summarized as “if a triangle‐free graph G$$ G $$ has certain properties, then it has a homomorphism to a triangle‐free graph Γ$$ \Gamma $$ of bounded size.” For example, bounds on homomorphism thresholds give such a statement if G$$ G $$ has sufficiently hi...

Lior Gishboliner, Eoin Hurley, Yuval Wigderson · 2 citations · ⚡2

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