Probability and opinion: A Study in the Medieval Presuppositions of Post-Medieval Theories of Probability

Modern physics has accustomed us to consider events which cannot give rise to certainty in our knowledge. A scientific knowledge of such events is nevertheless possible. The method which has enabled us to obtain a stable and exact knowledge about uncertain events consists in a kind of changing of plane and in the replacing of the study of individual phenomena by the study of statistical aggregates to which those phenomena can give rise. A statistical aggregate is not a collection of real ph...