Combining Texts

All the ideas for 'Locke on Essences and Kinds', 'Frege' and 'Scepticism'

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6 ideas

4. Formal Logic / B. Propositional Logic PL / 1. Propositional Logic

7726	Aristotelian logic dealt with inferences about concepts, and there were also proposition inferences [Weiner]

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]

27. Natural Reality / A. Classical Physics / 1. Mechanics / a. Explaining movement

20365

We only see points in motion, and thereby infer movement [Rescher]