Coverings and homotopy of a graph
Coverings and homotopy of a graph
复制标题
图的覆盖和同伦
DOI:
10.1016/j.disc.2018.03.028
复制
发表时间:
2018
影响因子:
0.8
通讯作者:
Suzuki Hiroshi
中科院分区:
文献类型:
--
作者:
Hamid Ahmadinezhad;Takuzo Okada;三枝崎剛;Takuzo Okada;Takuzo Okada;Takuzo Okada;Takuzo Okada;Takuzo Okada;Takuzo Okada;Takuzo Okada;Takuzo Okada;Suzuki Hiroshi
Let C be a collection of closed walks of a connected graph Γ. We study coverings and homotopy of Γ under the condition that every member of C can be lifted through covering morphisms, and is contractible. Since they depend on C, we call them C-coverings and C-homotopy. After we review the existence of universal C-covers and their uniqueness modulo isomorphism studied by EE Shult and others, we investigate conditions that a finite graph is C-simply connected, ie, the graph itself is a universal C-cover. As an application, we show that classes of distance-regular graphs and distance-semiregular graphs are C-simply connected when C is the collection of closed paths of minimal length. We also show a finiteness condition of a universal C-cover of a class of connected bipartite graphs when C is the collection of closed paths of minimal length.
登录
查看更多内容
影响因子:
0.7
作者:
S. Bang;Akira Hiraki;J. Koolen
通讯作者:
J. Koolen
DOI:
10.1007/s10623-005-0370-7
发表时间:
2006
期刊:
Designs, Codes and Cryptography
影响因子:
--
作者:
F. Clerck;S. Winter;Elisabeth Kuijken;Cristina Tonesi
通讯作者:
Cristina Tonesi
DOI:
10.1016/0095-8956(83)90015-1
发表时间:
1983
期刊:
J. Comb. Theory, Ser. B
影响因子:
--
作者:
Paul M. Terwilliger
通讯作者:
Paul M. Terwilliger
DOI:
10.1016/j.jcta.2015.01.006
发表时间:
2014-07
期刊:
J. Comb. Theory A
影响因子:
--
作者:
J. Bamberg;Alice Devillers;Joanna B. Fawcett;C. Praeger
通讯作者:
J. Bamberg;Alice Devillers;Joanna B. Fawcett;C. Praeger
DOI:
10.1016/s0012-365x(00)00045-5
发表时间:
2000
期刊:
Discret. Math.
影响因子:
--
作者:
H. A. Lewis
通讯作者:
H. A. Lewis