Lower Bounds on the Probability of a Finite Union of Events

Abstract

In this paper, lower bounds on the probability of a finite union of events are considered, i.e. $P\left({\bigcup }_{i=1}^N{A}_i\right)$, in terms of the individual event probabilities $\{P(A_i),i=1,\dots ,N\}$ and the sums of the pairwise event probabilities, i.e., $\{{\sum }_{j:j\ne i}P(A_i\cap A_j),i=1,\dots ,N\}$. The contribution of this paper includes the following: (i) in the class of all lower bounds that are established in terms of only the $P(A_i)$'s and ${\sum }_{j:j\ne i}P(A_i\cap A_j)$'s, the optimal lower bound is given numerically by solving a linear programming (LP) problem with $N^2-N+1$ variables; (ii) a new analytical lower bound is proposed based on a relaxed LP problem, which is at least as good as the bound due to Kuai, et al.; (iii) numerical examples are provided to illustrate the performance of the bounds.

arXiv commentSIAM Journal on Discrete Mathematics, 2016