This paper reconsiders Frank Ramsey's essay on subjective probability (1926) as a consistent way to articulate logic, rationality and knowledge. The first part of the essay builds an axiomatic theory of subjective probability based on 'formal logic', defining rationality as choice-consistency....

We aim at studying the original demonstration of the Ramsey Rule. This investigation shows that the introduction of the calculus of variations paradoxically remains cautious and reveals the very aims of Ramsey as well as his peculiar situation in the Cambridgian university scene. Classification...