Combining Texts

All the ideas for 'Investigations into Logical Deduction', 'Identity and Reference' and 'What Price Bivalence?'

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4 ideas

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 / H. Proof Systems / 4. Natural Deduction

13832

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

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]

18. Thought / B. Mechanics of Thought / 5. Mental Files

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An identity statement aims at getting the hearer to merge two mental files [Lockwood]