The study of prepositional probability logic and the flexibility of its logical relation

Probability logic is an important foundation for uncertainty reasoning. However there is a lot more to be done to make it perfect. The theory of universal logic is a new flexible logic system developed by Dr. Huacan He during his exploration of the uncertainty problems. Probability logic is a special case of it. Based on the ideas and methods of universal logic, we build a flexible prepositional probability logic system. This turns out to be an effective way to solve the problems in probability logic and to achieve the uncertainty reasoning in probability logic.