Combining Texts

All the ideas for 'works', 'Gentzen's Analysis of First-Order Proofs' and 'Letters to Thomas Burnett'

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6 ideas

5. Theory of Logic / A. Overview of Logic / 1. Overview of Logic

13831

Logic is based on transitions between sentences [Prawitz]

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

13825

Natural deduction introduction rules may represent 'definitions' of logical connectives [Prawitz]

5. Theory of Logic / H. Proof Systems / 4. Natural Deduction

13823

In natural deduction, inferences are atomic steps involving just one logical constant [Prawitz]

9. Objects / B. Unity of Objects / 2. Substance / a. Substance

13197

The notion of substance is one of the keys to true philosophy [Leibniz]

23. Ethics / C. Virtue Theory / 3. Virtues / a. Virtues

20239

Unlike us, the early Greeks thought envy was a good thing, and hope a bad thing [Hesiod, by Nietzsche]

26. Natural Theory / D. Laws of Nature / 8. Scientific Essentialism / c. Essence and laws

13198

Gravity is within matter because of its structure, and it can be explained. [Leibniz]