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Figure 1 purports to show [A → B] as one of the sets in the Venn diagram. But if [A → B] means the same thing as what it is usually taken to mean in propositional logic, then [A → B] is the same thing as [B ∪ A′ ]. Thus its probability should be 1 − x − y, or equivalently, s + t + u + v + w + z. How can the set labeled [A → B] in Figure 1 be regared as [A → B]? Michael Hardy (talk) 22:08, 27 September 2018 (UTC)@Knorlin:[reply]
ok, So it appears that the expression “[A → B]” is not intended to mean what it usually means in propositional logic. I think the article should be explicit about that. Michael Hardy (talk) 22:25, 27 September 2018 (UTC)[reply]
