λ1, Isoperimetric inequalities for graphs, and superconcentrators

N. Alon*, V. D. Milman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

A general method for obtaining asymptotic isoperimetric inequalities for families of graphs is developed. Some of these inequalities have been applied to functional analysis. This method uses the second smallest eigenvalue of a certain matrix associated with the graph and it is the discrete version of a method used before for Riemannian manifolds. Also some results are obtained on spectra of graphs that show how this eigenvalue is related to the structure of the graph. Combining these results with some known results on group representations many new examples are constructed explicitly of linear sized expanders and superconcentrators.

Original languageEnglish
Pages (from-to)73-88
Number of pages16
JournalJournal of Combinatorial Theory. Series B
Volume38
Issue number1
DOIs
StatePublished - Feb 1985

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