The Suppositional Theory says that one should believe a conditional to the degree that one believes its consequent to be true on the supposition that its antecedent is or were true, a claim known as the Ramsey Test hypothesis. The theory is widely reckoned to do a good job in explaining the patterns in our attitudes to conditionals and the linguistic behaviour that manifest them: our assertions and denials of different conditionals, the inferences we make with them, and so on. There has been much controversy around …
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