Combining Texts

All the ideas for 'What Price Bivalence?', 'Elements of Mathematical Logic' and 'The Foundations of Mathematics'

expand these ideas     |    start again     |     specify just one area for these texts

---

4 ideas

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

8942	Lukasiewicz's L3 logic has three truth-values, T, F and I (for 'indeterminate') [Lukasiewicz, by Fisher]

5. Theory of Logic / D. Assumptions for Logic / 1. Bivalence

19043

Bivalence applies not just to sentences, but that general terms are true or false of each object [Quine]

5. Theory of Logic / D. Assumptions for Logic / 2. Excluded Middle

18844

You would cripple mathematics if you denied Excluded Middle [Hilbert]

7. Existence / D. Theories of Reality / 10. Vagueness / d. Vagueness as linguistic

19042

Terms learned by ostension tend to be vague, because that must be quick and unrefined [Quine]