Combining Texts

All the ideas for 'fragments/reports', 'Intro to III: Quantifiers' and 'Investigations into Logical Deduction'

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4 ideas

5. Theory of Logic / G. Quantification / 4. Substitutional Quantification

9465	Substitutional universal quantification retains truth for substitution of terms of the same type [Jacquette]

9466	Nominalists like substitutional quantification to avoid the metaphysics of objects [Jacquette]

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]

13. Knowledge Criteria / E. Relativism / 2. Knowledge as Convention

1556	By nature people are close to one another, but culture drives them apart [Hippias]