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Oct 30, 2010 at 20:23 vote accept Anna T
Oct 24, 2010 at 22:50 comment added Nate Eldredge FYI, your notation is kind of odd. One usually uses capital letters for events, and usually calligraphic letters for sets of events, and set operations instead of logical operations. So I'd write the LHS as $2 \sum_{A \in \mathcal{A}, B \in \mathcal{B}} P(A \cap B)$.
Oct 24, 2010 at 21:57 answer added Fedor Petrov timeline score: 3
Oct 24, 2010 at 20:41 history asked Anna T CC BY-SA 2.5