Ideas from 'Intro to 'Philosophy of Logic'' by Dale Jacquette [2002], by Theme Structure

[found in 'Philosophy of Logic: an anthology' (ed/tr Jacquette,Dale) [Blackwell 2002,0-631-21868-8]].

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4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / a. Systems of modal logic
Modal logic is multiple systems, shown in the variety of accessibility relations between worlds
5. Theory of Logic / A. Overview of Logic / 1. Overview of Logic
The two main views in philosophy of logic are extensionalism and intensionalism
5. Theory of Logic / I. Semantics of Logic / 5. Extensionalism
Extensionalists say that quantifiers presuppose the existence of their objects
5. Theory of Logic / I. Semantics of Logic / 6. Intensionalism
Intensionalists say meaning is determined by the possession of properties
19. Language / B. Assigning Meanings / 7. Extensional Semantics
Extensionalist semantics forbids reference to nonexistent objects
Extensionalist semantics is circular, as we must know the extension before assessing 'Fa'