  Bruno de Finetti (1937, based on lectures of 1935), shortly after Ramsey and independently, also developed an account of probability as degree of belief. (Unlike Ramsey, de Finetti argued that this was the only kind of probability.) In a separate lecture (1936) he gave a theory of “conditional events” or “tri-events” as he called them. Like Ramsey, he provided an account of conditional judgements in terms of conditional probabilities, and gave a three-valued account of such a conditional “if \(p\), \(q\)”: true if \(p \:\&amp;\: q\), false if \(p \:\&amp;\: \neg q\), void if \(\neg p\). He also connects this with conditional bets: won if \(p \:\&amp;\: q\), lost if \(p \:\&amp;\: \neg q\), called off if \(\neg p\). He gives three-valued truth tables for the other connectives when applied to conditionals, and claims that the probability of a “tri-event” is the probability of its truth given that it has a truth value – which, in the case of “if \(p\), \(q\)” is just the probability of \(q\) given \(p\). The results for more complex sentences are controversial, but there has been a fair amount of work in this tradition, much of it summarised by Peter Milne (1997). It is interesting that this second exposition of probability as degree of belief also connected conditional degree of belief to ordinary conditional judgements, and also recognised that the latter could not then be treated as ordinary propositions.