Accuracy, probabilism, and the insufficiency of the alethic

Abstract The best and most popular argument for probabilism is the accuracy-dominance argument, which purports to show that alethic considerations alone support view an agent’s degrees of belief should always obey axioms probability. I argue extant versions face a problem. In order mathematics function as advertised, we must assume every omniscient credence classically consistent; there can be no worlds in set dominance-relevant some other logic. This restriction cannot motivated on grounds unless we’re also willing accept rationality requires metaphysical necessity, distinction between priori logical necessities posteriori ones not distinction. To justify consistent worlds, non-alethic motivation required. And thus, if version probabilism, it isn’t one grounded alone.