Abstract: Cohen criticizes the polycriterial account of probability whose representation is Popper'S mathematics throry for its not being genuinely explantory.On the basis of it,Cohen puts forward a new concept of probability construed as the degree of provability and as a result,probability·statements are treated as evaluations of inferential soundness.The essential feature of such a probability is its underlying unity and consequently,it can rionaly and satisfactorily explane probability'S being polycriterial and f...