Combining Texts

All the ideas for 'Symbolic Reasoning', 'Of Liberty and Necessity' and 'Knowing One's Own Mind'

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3 ideas

4. Formal Logic / F. Set Theory ST / 3. Types of Set / b. Empty (Null) Set

21548

The null class is the class with all the non-existents as its members [MacColl, by Lackey]

10. Modality / B. Possibility / 5. Contingency

6215	'Contingent' means that the cause is unperceived, not that there is no cause [Hobbes]

18. Thought / C. Content / 6. Broad Content

6175	External identification doesn't mean external location, as with sunburn [Davidson, by Rowlands]