Combining Texts

All the ideas for 'fragments/reports', 'The Runabout Inference Ticket' and 'Principles of Theoretical Logic'

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7 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]

5. Theory of Logic / E. Structures of Logic / 2. Logical Connectives / a. Logical connectives

17896

We need to know the meaning of 'and', prior to its role in reasoning [Prior,AN, by Belnap]

13836

Maybe introducing or defining logical connectives by rules of inference leads to absurdity [Prior,AN, by Hacking]

17898

Prior's 'tonk' is inconsistent, since it allows the non-conservative inference A |- B [Belnap on Prior,AN]

11021

Prior rejected accounts of logical connectives by inference pattern, with 'tonk' his absurd example [Prior,AN, by Read]

9. Objects / E. Objects over Time / 8. Continuity of Rivers

579	Cratylus said you couldn't even step into the same river once [Cratylus, by Aristotle]

13. Knowledge Criteria / D. Scepticism / 1. Scepticism

578	Cratylus decided speech was hopeless, and his only expression was the movement of a finger [Cratylus, by Aristotle]