A Study of the New Development in the Theory of Probability : A Resurrection of Logic of Partial Belief

PWhen we want to logically infer the course of things from the point of view of indeterminism, we always think about it by means of probability concept. Probability concept, which is a foundation of the inductive arguments, must be objective in order to inductively demonstrate. Probability concept must correspond to a certain meaning, and must be concretely perceived from data. As a semantic regulation and its perceptibility restrict probability concept, I think that the history of the theory of probability is the branching process caused by double regulations to probability concept. The object of this note is to have a view of the post-theory of probability through paying attention to new development for probability concept. We came to the conclusion that the new development represented resurrection of Ramsey's Logic of Partial Belief, and we have the expectation that the minds of Cambridge theory of probability will be succeeded to the future.departmental bulletin pape