Ideas from 'Intensions Revisited' by Willard Quine [1977], by Theme Structure

[found in 'Theories and Things' by Quine,Willard [Harvard 1981,0-674-87926-0]].

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4. Formal Logic / D. Modal Logic ML / 1. Modal Logic
Quantified modal logic collapses if essence is withdrawn
9. Objects / D. Essence of Objects / 15. Against Essentialism
Essences can make sense in a particular context or enquiry, as the most basic predicates
10. Modality / A. Necessity / 11. Denial of Necessity
Necessity is relative to context; it is what is assumed in an inquiry
10. Modality / E. Possible worlds / 1. Possible Worlds / e. Against possible worlds
Possible worlds are a way to dramatise essentialism, and yet they presuppose essentialism
10. Modality / E. Possible worlds / 3. Transworld Objects / b. Rigid designation
A rigid designator (for all possible worlds) picks out an object by its essential traits
11. Knowledge Aims / A. Knowledge / 3. Belief / a. Beliefs
Beliefs can be ascribed to machines