首页 | 本学科首页   官方微博 | 高级检索  
     检索      


Embedding frequencies of trees
Authors:R D Poshusta  M C McHughes
Institution:(1) Chemical Physics Program, Washington State University, 99164-4630 Pullman, WA, USA
Abstract:A graph gamma is said to be embedded in a graph Gamma if gamma is isomorphic to a subgraph of Gamma. The embedding frequency for gamma in Gamma,N( Gamma, gamma), is the number of different subgraphs of Gamma to which gamma is isomorphic. We use a computer program to calculate the embedding frequencies of subtrees within trees. We computeN(Gamma, gamma) for trees through 10 vertices and present the results in tabular form. When trees are partially ordered by valence class, their subtrees lie in corresponding order; we give a formal proof of this subtree embedding property. The structure of the embedding relation is exhibited in a topological picture of the zeta function showing the non-zero values ofN(Gamma, gamma).
Keywords:
本文献已被 SpringerLink 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号