Mathematics – Probability
Scientific paper
2012-03-05
Mathematics
Probability
5 pages
Scientific paper
Janson and Janson, Luczak and Rucinski proved several inequalities for the lower tail of the distribution of the number of events that hold, when all the events are up-sets (increasing events) of a special form -- each event is the product of some subset of a single set of independent Bernoulli random variables (i.e., a principal up-set). We show that these inequalities in fact hold for arbitrary up-sets, by modifying existing proofs to use only positive correlation, avoiding the need to assume positive correlation conditioned on one of the events.
Riordan Oliver
Warnke Lutz
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