 Of these three Ramsey is best known within philosophy for his somewhat sketchy description of what later became known as the Dutch Book argument or theorem, see Vineberg 2016. In his unpublished paper “Truth and Probability” (1926a), Ramsey proposed a set of axioms and assumptions, his Laws of Preference, which enable a subject to correlate the value of options \(\alpha, \beta, \gamma\) and the preference relation between them with real numbers under the standard ordering. Using \(\alpha\) etc. as Ramsey does to denote both the option and its correlated real number allows a subject in turn to equate their degree of belief in a proposition \(p\) with the ratio 