 To facilitate subsequent discussions, a bit of mathematical formalism is needed. Indeed, the two core Bayesian norms were only stated above in a simple, finite setting  (section 1.2),  but there can be an infinity of possibilities under consideration. For example, think about this question: What’s the objective, physical chance for a carbon-14 atom to decay in 20 years? Every possible chance in the unit interval \([0, 1]\) is a possibility to which a credence can be assigned. So the two core Bayesian norms need to be stated in a more general way than above.