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Ideas for 'Logic (Encyclopedia I)', 'Naming and Necessity lectures' and 'Truth and Truthmakers'

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3 ideas

4. Formal Logic / D. Modal Logic ML / 1. Modal Logic

10559

Kripke's modal semantics presupposes certain facts about possible worlds [Kripke, by Zalta]

4. Formal Logic / F. Set Theory ST / 1. Set Theory

18396

The set theory brackets { } assert that the member is a unit [Armstrong]

4. Formal Logic / F. Set Theory ST / 3. Types of Set / b. Empty (Null) Set

18393

For 'there is a class with no members' we don't need the null set as truthmaker [Armstrong]