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Proper rainbow saturation for trees
Combinatorics · Submitted 23 Sep 2024
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We obtain exact and asymptotic results on $\text{sat}^*(n,T)$ for several infinite families of trees.
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The abstract, sentence by sentence
Given a graph $H$, we say that a graph $G$ is properly rainbow $H$-saturated if: (1) There is a proper edge colouring of $G$ containing no rainbow copy of $H$; (2) For every $e \notin E(G)$, every proper edge colouring of $G+e$ contains a rainbow copy of $H$. The proper rainbow saturation number $\text{sat}^*(n,H)$ is the minimum number of edges in a properly rainbow $H$-saturated graph. In this paper we initiate a systematic study of the proper rainbow saturation number for trees. We obtain exact and asymptotic results on $\text{sat}^*(n,T)$ for several infinite families of trees. Our proofs reveal connections to the classical saturation and semi-saturation numbers.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | Given a graph $H$, we say that a graph $G$ is properly rainbow $H$-saturated if: (1) There is a proper edge colouring of $G$ containing no rainbow copy of $H$; (2) For every $e \notin E(G)$, every proper edge colouring of $G+e$ contains a rainbow copy of $H$. | background 1.00 | 0.06 | 0.03 | asserted 0.88 |
| s1 | The proper rainbow saturation number $\text{sat}^*(n,H)$ is the minimum number of edges in a properly rainbow $H$-saturated graph. | background 0.99 | 0.10 | 0.04 | asserted 0.94 |
| s2 | In this paper we initiate a systematic study of the proper rainbow saturation number for trees. | contribution 0.99 | 0.83 | 0.06 | asserted 0.98 |
| s3 | We obtain exact and asymptotic results on $\text{sat}^*(n,T)$ for several infinite families of trees. | result 0.90 | 0.97 | 0.72 | asserted 1.00 |
| s4 | Our proofs reveal connections to the classical saturation and semi-saturation numbers. | interpretation 0.95 | 0.89 | 0.10 | asserted 1.00 |
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Original abstract
Given a graph $H$, we say that a graph $G$ is properly rainbow $H$-saturated if: (1) There is a proper edge colouring of $G$ containing no rainbow copy of $H$; (2) For every $e \notin E(G)$, every proper edge colouring of $G+e$ contains a rainbow copy of $H$. The proper rainbow saturation number $\text{sat}^*(n,H)$ is the minimum number of edges in a properly rainbow $H$-saturated graph. In this paper we initiate a systematic study of the proper rainbow saturation number for trees. We obtain exact and asymptotic results on $\text{sat}^*(n,T)$ for several infinite families of trees. Our proofs reveal connections to the classical saturation and semi-saturation numbers.
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Prior to this work, asymptotically tight bounds on $(n,H)$ were only known for $H = C_4$ (Halfpap, Lidický, and Masařík [ref] ), and $H = P_4$ (Bushaw, Johnston, and Rombach [ref] ).
2403.15602 · Introduction · 0.88
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