Combining Texts

All the ideas for 'works', 'New Foundations for Mathematical Logic' and 'Conditional Assertion and Restricted Quantification'

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3 ideas

4. Formal Logic / F. Set Theory ST / 4. Axioms for Sets / a. Axioms for sets

9879	NF has no models, but just blocks the comprehension axiom, to avoid contradictions [Quine, by Dummett]

5. Theory of Logic / D. Assumptions for Logic / 3. Contradiction

10121

Contradiction is not a sign of falsity, nor lack of contradiction a sign of truth [Pascal]

14. Science / C. Induction / 5. Paradoxes of Induction / b. Raven paradox

19000

Read 'all ravens are black' as about ravens, not as about an implication [Belnap]