Combining Texts

All the ideas for 'Extrinsic Properties', 'An Enquiry' and 'On the Syllogism IV'

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6 ideas

5. Theory of Logic / E. Structures of Logic / 6. Relations in Logic

17744

De Morgan started the study of relations and their properties [De Morgan, by Walicki]

13501

De Morgan found inferences involving relations, which eluded Aristotle's syllogistic [De Morgan, by Hart,WD]

8. Modes of Existence / B. Properties / 4. Intrinsic Properties

14979

Being alone doesn't guarantee intrinsic properties; 'being alone' is itself extrinsic [Lewis, by Sider]

15454

Extrinsic properties come in degrees, with 'brother' less extrinsic than 'sibling' [Lewis]

9. Objects / A. Existence of Objects / 5. Individuation / b. Individuation by properties

15455

Total intrinsic properties give us what a thing is [Lewis]

13. Knowledge Criteria / C. External Justification / 7. Testimony

23549

We treat testimony with a natural trade off of belief and caution [Reid, by Fricker,M]