Ideas from 'Inessential Aristotle: Powers without Essences' by Anjan Chakravarrty [2012], by Theme Structure

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8. Modes of Existence / C. Powers and Dispositions / 1. Powers
Powers give explanations, without being necessary for some class membership
9. Objects / D. Essence of Objects / 5. Essence as Kind
A kind essence is the necessary and sufficient properties for membership of a class
9. Objects / D. Essence of Objects / 15. Against Essentialism
Cluster kinds are explained simply by sharing some properties, not by an 'essence'
14. Science / D. Explanation / 2. Types of Explanation / f. Causal explanations
Explanation of causal phenomena concerns essential kinds - but also lack of them
26. Natural Theory / B. Concepts of Nature / 6. Natural Kinds / d. Source of kinds
Some kinds, such as electrons, have essences, but 'cluster kinds' do not
26. Natural Theory / D. Laws of Nature / 1. Laws of Nature
Many causal laws do not refer to kinds, but only to properties