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
中科院分区:
文献类型:
--
作者:
Haghparast Nastaran;Hasanvand Morteza;Ohno Yumiko
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.
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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
影响因子:
0.8
作者:
F. Harary;S. Hedetniemi;G. Prins
通讯作者:
G. Prins
DOI:
--
发表时间:
2006
期刊:
--
影响因子:
--
作者:
Iroon Polytechniou-
通讯作者:
Iroon Polytechniou-
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