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'Universal Prescriptivism', 'Elements of Mathematical Logic' and 'On 'Insolubilia' and their solution'
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2 ideas
4. Formal Logic / E. Nonclassical Logics / 3. Many-Valued Logic
8942
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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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4. Formal Logic / F. Set Theory ST / 5. Conceptions of Set / c. Logical sets
21563
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The 'no classes' theory says the propositions just refer to the members [Russell]
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