Combining Texts

Ideas for 'Definitiones cogitationesque metaphysicae', 'A Theory of Universals' and 'Plurals and Complexes'

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5 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 / F. Set Theory ST / 4. Axioms for Sets / j. Axiom of Choice IX

10676

The Axiom of Choice is a non-logical principle of set-theory [Hossack]

10686

The Axiom of Choice guarantees a one-one correspondence from sets to ordinals [Hossack]

4. Formal Logic / F. Set Theory ST / 8. Critique of Set Theory

10687

Maybe we reduce sets to ordinals, rather than the other way round [Hossack]

4. Formal Logic / G. Formal Mereology / 3. Axioms of Mereology

10677

Extensional mereology needs two definitions and two axioms [Hossack]