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Published online by Cambridge University Press: 01 January 2000
We prove the following conjecture of J. van den Berg and H. Kesten. For any events [Ascr] and [Bscr] in a product probability space, Prob([Ascr]□[Bscr]) [les ] Prob([Ascr])Prob([Bscr]), where [Ascr]□[Bscr] is the event that [Ascr] and [Bscr] occur ‘disjointly’.