Combining Texts

All the ideas for 'On the Syllogism IV', 'In Metaphysics' and 'Answer to 'What is Enlightenment?''

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5 ideas

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

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

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

7. Existence / A. Nature of Existence / 6. Criterion for Existence

16660

Are things distinct if they are both separate, or if only one of them can be separate? [Duns Scotus, by Pasnau]

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

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Substance is only grasped under the general heading of 'being' [Duns Scotus]

25. Social Practice / A. Freedoms / 3. Free speech

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Enlightenment requires the free use of reason in the public realm [Kant]