Combining Texts
Ideas for
'On the Philosophy of Logic', 'The Union of Body and Soul' and 'The Principles of Mathematics'
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7 ideas
4. Formal Logic / E. Nonclassical Logics / 3. Many-Valued Logic
8943
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Three-valued logic says excluded middle and non-contradition are not tautologies [Fisher]
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4. Formal Logic / E. Nonclassical Logics / 4. Fuzzy Logic
8945
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Fuzzy logic has many truth values, ranging in fractions from 0 to 1 [Fisher]
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4. Formal Logic / F. Set Theory ST / 3. Types of Set / b. Empty (Null) Set
14113
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The null class is a fiction [Russell]
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4. Formal Logic / F. Set Theory ST / 5. Conceptions of Set / d. Naïve logical sets
15894
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Russell invented the naïve set theory usually attributed to Cantor [Russell, by Lavine]
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4. Formal Logic / F. Set Theory ST / 6. Ordering in Sets
14126
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Order rests on 'between' and 'separation' [Russell]
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14127
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Order depends on transitive asymmetrical relations [Russell]
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4. Formal Logic / G. Formal Mereology / 1. Mereology
14121
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The part-whole relation is ultimate and indefinable [Russell]
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