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Nonfactualism/NF/Field: must assume that acceptance of conditionals is not regulated by the normal probability law, which governs the acceptance of "fact sentences".
Linearity Principle/Lewis/Field: P(D) = P (D I B). P(B) + P(D I ~ B). P(~ B) - is not acceptable for the nonfactualism if D is a form of A > C. - That is, the law for belief degree fails.
Belief Degree/conditional: in conditional conditions, the classical probability laws for belief degrees do not apply. - disquotational truth/conditional: refers to the whole: "when Clinton dies Gore becomes President" is true iff Clinton dies and Gore becomes president - Non-disquotational: with simple sentences such as disquotational truth. - For conditionals: simplest solution: without truth value.
Realism, Mathematics and Modality Oxford New York 1989
Truth and the Absence of Fact Oxford New York 2001
Science without numbers Princeton New Jersey 1980