Ramsey Results for Cycle Spectra

Ramsey Results for Cycle Spectra
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拉姆齐循环光谱结果

DOI:
10.1002/jgt.21704
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发表时间:
2013
影响因子:
0.9
通讯作者:
D. Rautenbach
D. Rautenbach
中科院分区:
数学3区
文献类型:
--
作者:
S. Brandt;Felix Joos;Janina Müttel;D. Rautenbach

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设C(G)表示n阶图G的圈长集,G <$表示G的补图.证明了当n≥6时,C(G)<$C(G <$)包含所有3≤ k ≤co的奇整数和所有4≤ k ≤ce的偶整数,其中co和ce分别表示C(G)<$C(G <$)中的最大奇整数和最大偶整数.由此我们推出集合C(G)<$C(G <$)至少包含2n 3 −2个整数,这是尖锐的。
Let C(G) denote the set of lengths of cycles of a graph G of order n and let G¯ denote the complement of G. We show that if n≥6 , then C(G)∪C(G¯) contains all odd ℓ with 3≤ℓ≤co and all even ℓ with 4≤ℓ≤ce , where co and ce denote the maximum odd and the maximum even integer in C(G)∪C(G¯) , respectively. From this we deduce that the set C(G)∪C(G¯) contains at least 2n3−2 integers, which is sharp.