Combining Texts

All the ideas for 'Locke on Essences and Kinds', 'On the Syllogism IV' and 'A Realistic Theory of Categories'

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7 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]

7. Existence / E. Categories / 3. Proposed Categories

13120

Chisholm divides things into contingent and necessary, and then individuals, states and non-states [Chisholm, by Westerhoff]

9. Objects / D. Essence of Objects / 13. Nominal Essence

15642

If kinds depend only on what can be observed, many underlying essences might produce the same kind [Eagle]

15645

Nominal essence are the observable properties of things [Eagle]

15643

Nominal essence mistakenly gives equal weight to all underlying properties that produce appearances [Eagle]

26. Natural Theory / B. Natural Kinds / 4. Source of Kinds

15641

Kinds are fixed by the essential properties of things - the properties that make it that kind of thing [Eagle]