Combining Philosophers

Ideas for Melvin Fitting, Fabrice Correia and David M. Armstrong

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7 ideas

4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / g. System S4

15544

If what is actual might have been impossible, we need S4 modal logic [Armstrong, by Lewis]

4. Formal Logic / E. Nonclassical Logics / 8. Intensional Logic

15375

If terms change their designations in different states, they are functions from states to objects [Fitting]

15376

Intensional logic adds a second type of quantification, over intensional objects, or individual concepts [Fitting]

4. Formal Logic / E. Nonclassical Logics / 9. Awareness Logic

15378

Awareness logic adds the restriction of an awareness function to epistemic logic [Fitting]

4. Formal Logic / E. Nonclassical Logics / 10. Justification Logics

15379

Justication logics make explicit the reasons for mathematical truth in proofs [Fitting]

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]