The existence of uniform hypergraphs for which the interpolation property of complete coloring fails

The existence of uniform hypergraphs for which the interpolation property of complete coloring fails
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完全着色插值性质失效的均匀超图的存在性

DOI:
10.1016/j.disc.2021.112722
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发表时间:
2022
影响因子:
0.8
通讯作者:
Ohno Yumiko
Ohno Yumiko
中科院分区:
数学3区
文献类型:
--
作者:
Haghparast Nastaran;Hasanvand Morteza;Ohno Yumiko

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1967年Harary,Hedetniemi,and Prins证明了图G对任意t都有完全t-染色,且χ(G)≤ t≤ λ(G),其中χ(G)表示图G的色数,λ(G)表示图G的消色数,它是图G有完全r-染色的最大数r.最近,Edwards和Rza Riza Eschenewski(2020)证明了对于任意整数k(k≥ 9),存在一个k-一致超图H,它具有完全χ(H)-染色和完全t(H)-染色,但对于某些t(x(H)< t<t(H)),它不具有完全t-染色。他们还问是否会存在这样一个3-一致超图的例子,并提出了另一个问题来加强他们的结果。本文将他们的结果推广到所有k≥ 3的情况,并通过给出几个3-一致超图的例子解决了他们的问题。特别地,我们反驳了最近由松本和Ohno(2020)提出的一个猜想,他们提出了一个特殊的3-一致超图族来满足所需的插值性质。
Abstract In 1967 Harary, Hedetniemi, and Prins showed that every graph G admits a complete t-coloring for every t with χ (G)≤ t≤ ψ (G), where χ (G) denotes the chromatic number of G and ψ (G) denotes the achromatic number of G which is the maximum number r for which G admits a complete r-coloring. Recently, Edwards and Rza̧żewski (2020) showed that this result fails for hypergraphs by proving that for every integer k with k≥ 9, there exists a k-uniform hypergraph H with a complete χ (H)-coloring and a complete ψ (H)-coloring, but no complete t-coloring for some t with χ (H)< t< ψ (H). They also asked whether there would exist such an example for 3-uniform hypergraphs and posed another problem to strengthen their result. In this paper, we generalize their result to all cases k with k≥ 3 and settle their problems by giving several examples of 3-uniform hypergraphs. In particular, we disprove a recent conjecture due to Matsumoto and Ohno (2020) who suggested a special family of 3-uniform hypergraph to satisfy the desired interpolation property.
DOI: 10.1016/j.endm.2015.06.042
发表时间: 2015
期刊: Eur. J. Comb.
影响因子: --
作者:
Michał Deͅbski;Zbigniew Lonc;Paweł Rzaͅżewski
通讯作者: Paweł Rzaͅżewski
DOI: --
发表时间: 1967
影响因子: 0.8
作者:
F. Harary;S. Hedetniemi;G. Prins
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发表时间: 2006
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Iroon Polytechniou-
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DOI: 10.1016/j.disc.2019.111673
发表时间: 2020
期刊: Discret. Math.
影响因子: --
作者:
Keith J. Edwards;Paweł Rzaͅżewski
通讯作者: Paweł Rzaͅżewski