Combining Texts
Ideas for
'Logic (Encyclopedia I)', 'On the Philosophy of Logic' and 'Negation'
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5 ideas
4. Formal Logic / E. Nonclassical Logics / 2. Intuitionist Logic
18789
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Intuitionist logic looks best as natural deduction [Mares]
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18790
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Intuitionism as natural deduction has no rule for negation [Mares]
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4. Formal Logic / E. Nonclassical Logics / 3. Many-Valued Logic
18787
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Three-valued logic is useful for a theory of presupposition [Mares]
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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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