  A specific difficulty of analyzing beliefs of this second category derives from the need to identify attitudes held towards several atomic sentences at the same time. While considering atomic sentences one by one, Ramsey says, an agent only needs to consider two mutually exclusive feelings, those of full belief and full disbelief. The ‘intermediate attitudes of partial belief’, which he proposes to ‘leave to the theory of probability’ (1927a, [PP] 45), are discussed in ‘Truth and Probability’. To deal with attitudes held towards various atomic sentences at once, Ramsey borrows from the former Wittgenstein the notion of truth-possibility. When n atomic sentences are at play, there are 2n possible combinations of fully believing and fully disbelieving. Thus, ‘the meaning of a sentence is agreement and disagreement with such and such truth-possibilities’ (op. cit., 46), and a proposition is ‘a disjunction of the truth-possibilities with which [it] agrees’ (op. cit., 47).