Combining Texts

All the ideas for 'Investigations into Logical Deduction', 'Papers of 1918' and 'People and Their Bodies'

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3 ideas

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]

9. Objects / E. Objects over Time / 5. Temporal Parts

16209

How can point-duration slices of people have beliefs or desires? [Thomson]

19. Language / D. Propositions / 4. Mental Propositions

22307

Propositions don't name facts, because two opposed propositions can match one fact [Russell]