 Robert Stalnaker’s first paper on the subject, “A Theory of Conditionals”, appeared in 1968. Stalnaker refers to Ramsey. He also mentions Adams (1966) in a footnote, and indicates that he will devote another paper to the probabilistic aspects of the theory. This is his “Probability and Conditionals” (1970), and its abstract announces that “conditional propositions are introduced as propositions whose absolute probability is equal to the conditional probability of the consequent given the antecedent”. Then David Lewis (1976) proved that there is no proposition the probability of whose truth can be systematically equated with the conditional probability of \(B\) given \(A\) – a result which Ramsey and de Finetti appear to have foreseen.