Combining Philosophers
Ideas for William W. Tait, Volker Halbach and Agathon
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6 ideas
4. Formal Logic / E. Nonclassical Logics / 3. Many-Valued Logic
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In Strong Kleene logic a disjunction just needs one disjunct to be true [Halbach]
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In Weak Kleene logic there are 'gaps', neither true nor false if one component lacks a truth value [Halbach]
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4. Formal Logic / F. Set Theory ST / 1. Set Theory
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To prove the consistency of set theory, we must go beyond set theory [Halbach]
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Every attempt at formal rigour uses some set theory [Halbach]
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4. Formal Logic / F. Set Theory ST / 3. Types of Set / b. Empty (Null) Set
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The null set was doubted, because numbering seemed to require 'units' [Tait]
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4. Formal Logic / F. Set Theory ST / 7. Natural Sets
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We can have a series with identical members [Tait]
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