Combining Philosophers

Ideas for H.Putnam/P.Oppenheim, Ori Simchen and Dorothy Edgington

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4 ideas

4. Formal Logic / B. Propositional Logic PL / 2. Tools of Propositional Logic / c. Derivation rules of PL

14273

Conditional Proof is only valid if we accept the truth-functional reading of 'if' [Edgington]

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

16186

The Barcan Formulas express how to combine modal operators with classical quantifiers [Simchen]

16187

The Barcan Formulas are orthodox, but clash with the attractive Actualist view [Simchen]

16190

BF implies that if W possibly had a child, then something is possibly W's child [Simchen]