Combining Philosophers

Ideas for Philodemus, Barbara Vetter and Seymour Lipschutz

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4 ideas

4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / c. System D

19033

Deontic modalities are 'ought-to-be', for sentences, and 'ought-to-do' for predicates [Vetter]

4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / h. System S5

19032

S5 is undesirable, as it prevents necessities from having contingent grounds [Vetter]

4. Formal Logic / D. Modal Logic ML / 7. Barcan Formula

19036

The Barcan formula endorses either merely possible things, or makes the unactualised impossible [Vetter]

4. Formal Logic / F. Set Theory ST / 3. Types of Set / e. Equivalence classes

8920	Equivalence relations are reflexive, symmetric and transitive, and classify similar objects [Lipschutz]