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On the Edge-Expansion of Graphs

  • NOGA ALON (a1)
    • Published online: 01 June 1997
Abstract

It is shown that if n>n0(d) then any d-regular graph G=(V, E) on n vertices contains a set of u=[lfloor ]n/2[rfloor ] vertices which is joined by at most (d/2−cd)u edges to the rest of the graph, where c>0 is some absolute constant. This is tight, up to the value of c.

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Combinatorics, Probability and Computing
  • ISSN: 0963-5483
  • EISSN: 1469-2163
  • URL: /core/journals/combinatorics-probability-and-computing
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