 With this definition of the function \(\bel(p)\) and its further extension \(\bel(p\mid q)\) to conditional belief in \(p\) given \(q\), for which Ramsey claims credit, he argues that if a subject’s degrees of belief are consistent in the sense of obeying these Laws of Preference (alternatively, as Ramsey simply states, do not allow a [Dutch] book to be made against him by which he would lose in any event) then \(Bel\) must satisfy the “fundamental laws of probable belief (degrees of belief between 0 and 1)”, which he gives as: