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It provides a charitable interpretation of our ordinary talk about the future, and allows us to retain a principle of bivalence for propositions and to retain the law of excluded middle in the logic of propositions about the future.
Liars are problematic because, given the law of excluded middle (LEM, [?
JONES In De Interpretatione 6-9, Aristotle considers three logical principles: the principle of bivalence, the law of excluded middle, and the rule of contradictory pairs (according to which of any contradictory pair of statements, exactly one is true and the other false).
Sections XVII-XX concern the implications for the principle of bivalence, the law of excluded middle, and the principle of noncontradiction.
While Hintikka's IF logic is an extension of standard logic, it lacks several of standard logic's critical features: it does not admit a complete axiomatization or a Tarski-type truth definition, and, perhaps most critically, the law of excluded middle does not hold.