Combining Texts

All the ideas for 'works', 'Reply to Fifth Objections' and 'works'

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8 ideas

4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / h. System S5

7791	The simplest of the logics based on possible worlds is Lewis's S5 [Lewis,CI, by Girle]

5. Theory of Logic / G. Quantification / 2. Domain of Quantification

17743

De Morgan introduced a 'universe of discourse', to replace Boole's universe of 'all things' [De Morgan, by Walicki]

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

3626	Knowing the attributes is enough to reveal a substance [Descartes]

10. Modality / A. Necessity / 2. Nature of Necessity

11002

Equating necessity with informal provability is the S4 conception of necessity [Lewis,CI, by Read]

12. Knowledge Sources / A. A Priori Knowledge / 3. Innate Knowledge / a. Innate knowledge

3630	Our thinking about external things doesn't disprove the existence of innate ideas [Descartes]

18. Thought / D. Concepts / 2. Origin of Concepts / c. Nativist concepts

3631	A blind man may still contain the idea of colour [Descartes]

28. God / B. Proving God / 2. Proofs of Reason / a. Ontological Proof

3640	Possible existence is a perfection in the idea of a triangle [Descartes]

3639	Necessary existence is a property which is uniquely part of God's essence [Descartes]