Combining Texts

All the ideas for 'New Foundations for Mathematical Logic', 'Papancasudani' and 'Investigations into Logical Deduction'

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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 / H. Proof Systems / 4. Natural Deduction

13832

Natural deduction shows the heart of reasoning (and sequent calculus is just a tool) [Gentzen, by Hacking]

25. Social Practice / F. Life Issues / 1. Causing Death

7907	Human killing is worse if the victim is virtuous [Buddhaghosa]