Thresholds and Expectation Thresholds

  • Authors:
  • JEFF KAHN;GIL KALAI

  • Affiliations:
  • Department of Mathematics, Rutgers University, Piscataway NJ 08854USA;Department of Mathematics, The Hebrew University, Jerusalem, Israeljkahn@math.rutgers.edu, kalai@math.huji.ac.il

  • Venue:
  • Combinatorics, Probability and Computing
  • Year:
  • 2007

Quantified Score

Hi-index 0.00

Visualization

Abstract

We consider relations between thresholds for monotone set properties and simple lower bounds for such thresholds. A motivating example (Conjecture 2): Given an n-vertex graph H, write pE for the least p such that, for each subgraph H' of H, the expected number of copies of H' in G=G(n, p) is at least 1, and pc for that p for which the probability that G contains (a copy of) H is 1/2. Then (conjecture) pc=O(pElog n). Possible connections with discrete isoperimetry are also discussed.