1. This paper was written in a period of research on inductive logic supported by the National Science Foundation (Grant G 22315).
2. ‘The aim of inductive logic’;Carnap,1962
3. The foundations of mathematics and other logical essays;Ramsey,1931
4. ‘La prévision: ses lois logiques, ses sources subjectives’;De Finetti;Annales de l'Institut Henri Poincaré,1937
5. Studies in subjective probability,1964