English

Looking for vertex number one

Combinatorics 2016-05-20 v3 Data Structures and Algorithms

Abstract

Given an instance of the preferential attachment graph Gn=([n],En)G_n=([n],E_n), we would like to find vertex 1, using only 'local' information about the graph; that is, by exploring the neighborhoods of small sets of vertices. Borgs et. al gave an an algorithm which runs in time O(log4n)O(\log^4 n), which is local in the sense that at each step, it needs only to search the neighborhood of a set of vertices of size O(log4n)O(\log^4 n). We give an algorithm to find vertex 1, which w.h.p. runs in time O(ωlogn)O(\omega\log n) and which is local in the strongest sense of operating only on neighborhoods of single vertices. Here ω=ω(n)\omega=\omega(n) is any function that goes to infinity with nn.

Keywords

Cite

@article{arxiv.1408.6821,
  title  = {Looking for vertex number one},
  author = {Alan Frieze and Wesley Pegden},
  journal= {arXiv preprint arXiv:1408.6821},
  year   = {2016}
}

Comments

As accepted for AAP

R2 v1 2026-06-22T05:43:14.838Z