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https://dx.doi.org/10.48550/ar...
Article . 2016
License: arXiv Non-Exclusive Distribution
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The 2-Ranking Numbers of Graphs

Authors: Almeter, Jordan; Demircan, Samet; Kallmeyer, Andrew; Milans, Kevin G.; Winslow, Robert;

The 2-Ranking Numbers of Graphs

Abstract

In a graph whose vertices are assigned integer ranks, a path is well-ranked if the endpoints have distinct ranks or some interior point has a higher rank than the endpoints. A ranking is an assignment of ranks such that all nontrivial paths are well-ranked. A $k$-ranking is a relaxation in which all nontrivial paths of length at most $k$ are well-ranked. The $k$-ranking number of a graph $G$ is the minimum $t$ such that there is a $k$-ranking of $G$ using ranks in $\{1,\ldots,t\}$. We prove that the $2$-ranking number of the $n$-dimensional hypercube $Q_n$ is $n+1$. As a corollary, we improve the bounds on the star chromatic number of products of cycles when each cycle has length divisible by $4$. For $m\le n$, we show that the $2$-ranking number of $K_m \mathop\square K_n$ is $��(n\log m)$ and $O(nm^{\log_2(3)-1})$ with an asymptotic result when $m$ is constant and an exact result when $m!$ divides $n$. We prove that every subcubic graph has $2$-ranking number at most $7$, and we also prove the existence of a graph with maximum degree $k$ and $2$-ranking number $��(k^2/\log(k))$.

Keywords

FOS: Mathematics, Mathematics - Combinatorics, Combinatorics (math.CO)

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
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