Introduction 1. Russell's version of the theory of definite descriptions 2. Existential import, 'E!' and 'the' 3. The reduction of two paradoxes and the significance thereof 4. The Hilbert-Bernays theory of definite descriptions 5. Foundations of the hierarchy of positive free definite description theories 6. Predication and extensionality 7. Nonextensionality 8. The philosophical foundations of free logic 9. Logical truth and microphysics.
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