Integrated semantics and logic metric spaces
Fuzzy Sets and Systems - Logic and algebra
Random worlds and maximum entropy
Journal of Artificial Intelligence Research
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We construct and study a new intrinsic fuzzy subset @t on the crisp set F of all first-order logic formulas in two-valued logic. In order to define this fuzzy set, we need to introduce a number of other new concepts, such as the relative satisfiability degree, the least and the largest interpretations, and the average validity degree of a formula. One of the main results proved in this paper is that all the membership degrees of this fuzzy set form a dense subset of [0,1]. This new intrinsic fuzzy set will be used to develop a kind of fuzzy deductive reasoning of Pavelka's type.