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On constructing expanders for any number of vertices

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

Abstract

While typical constructions of explicit expanders work for certain sizes (i.e., number of vertices), one can obtain constructions of about the same complexity by manipulating the original expanders. One way of doing so is detailed and analyzed below. For any mε[0.5n,n] (equiv., nε[m,2m]), given an m-vertex expander, Gm, we construct an n-vertex expander by connecting each of the first n-m vertices of Gm to an (otherwise isolated) new vertex, and adding edges arbitrarily to regain regularity. Our analysis of this construction uses the combinatorial definition of expansion.

Original languageEnglish GB
Title of host publicationComputational Complexity and Property Testing
Subtitle of host publicationOn the Interplay Between Randomness and Computation
EditorsOded Goldreich
PublisherSpringer Verlag
Chapter2
Pages374-379
Number of pages6
DOIs
StatePublished - 4 Apr 2020

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Volume12050 LNCS

ASJC Scopus subject areas

  • Theoretical Computer Science
  • General Computer Science

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