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'reports', 'Elements of Mathematical Logic' and 'Model Theory for Modal Logic I'
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4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / h. System S5
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S5 provides the correct logic for necessity in the broadly logical sense [Fine,K]
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4. Formal Logic / E. Nonclassical Logics / 3. Many-Valued Logic
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Lukasiewicz's L3 logic has three truth-values, T, F and I (for 'indeterminate') [Lukasiewicz, by Fisher]
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