On the Edge-Expansion of Graphs

  • Authors:
  • Noga Alon

  • Affiliations:
  • Department of Mathematics, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv, Israel (e-mail: noga@math.tau.ac.il)

  • Venue:
  • Combinatorics, Probability and Computing
  • Year:
  • 1997

Quantified Score

Hi-index 0.00

Visualization

Abstract

It is shown that if nn0(d) then any d-regular graph G=(V, E) on n vertices contains a set of u=⌊n/2⌋ vertices which is joined by at most (d/2−c√d)u edges to the rest of the graph, where c0 is some absolute constant. This is tight, up to the value of c.