Combining Philosophers

Ideas for Eubulides, Mark Colyvan and Brian Ellis

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3 ideas

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

13604

Real possibility and necessity has the logic of S5, which links equivalence classes of worlds of the same kind [Ellis]

4. Formal Logic / E. Nonclassical Logics / 2. Intuitionist Logic

17926

Rejecting double negation elimination undermines reductio proofs [Colyvan]

17925

Showing a disproof is impossible is not a proof, so don't eliminate double negation [Colyvan]