Combining Texts

Ideas for 'Issues of Pragmaticism', 'Principles of Theoretical Logic' and 'Axiomatic Theories of Truth'

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4 ideas

4. Formal Logic / C. Predicate Calculus PC / 1. Predicate Calculus PC

17750

The first clear proof of the consistency of the first order predicate logic was in 1928 [Hilbert/Ackermann, by Walicki]

4. Formal Logic / E. Nonclassical Logics / 3. Many-Valued Logic

16335

In Strong Kleene logic a disjunction just needs one disjunct to be true [Halbach]

16334

In Weak Kleene logic there are 'gaps', neither true nor false if one component lacks a truth value [Halbach]

4. Formal Logic / F. Set Theory ST / 1. Set Theory

16309

Every attempt at formal rigour uses some set theory [Halbach]