View source for Cameron–Erdős conjecture

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The statement that the number of [[sum-free set]]s contained in $\{1,\ldots,N\}$ is $O\left({2^{N/2}}\right)$.  The conjecture was stated by Peter Cameron and Paul Erdős in 1988.  It was proved by Ben Green in 2003.

==References==
* P.J. Cameron and P. Erdős, ''On the number of sets of integers with various properties'', Number theory (Banff, 1988), de Gruyter, Berlin 1990, pp.61-79 {{ZBL|0695.10048}}
* B. Green, ''The Cameron-Erdős conjecture'', Bulletin of the London Mathematical Society '''36''' (2004) pp.769-778 {{ZBL|1074.11013}}