Combining Texts

All the ideas for 'fragments/reports', 'On the Source of Necessity' and 'Investigations into Logical Deduction'

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7 ideas

4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / g. System S4

15102

S4 says there must be some necessary truths (the actual ones, of which there is at least one) [Cameron]

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 / A. Nature of Existence / 3. Being / d. Non-being

18933

Not-Being obviously doesn't exist, and the five modes of Being are all impossible [Gorgias, by Diog. Laertius]

10. Modality / C. Sources of Modality / 1. Sources of Necessity

15103

Blackburn fails to show that the necessary cannot be grounded in the contingent [Cameron]

19. Language / F. Communication / 1. Rhetoric

5864	Destroy seriousness with laughter, and laughter with seriousness [Gorgias]

9866	Gorgias says rhetoric is the best of arts, because it enslaves without using force [Gorgias, by Plato]

27. Natural Reality / D. Time / 1. Nature of Time / f. Eternalism

15104

The 'moving spotlight' theory makes one time privileged, while all times are on a par ontologically [Cameron]