Combining Texts

Ideas for 'fragments/reports', 'Negation' and 'Mere Possibilities'

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5 ideas

4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / a. Systems of modal logic

16468

Non-S5 can talk of contingent or necessary necessities [Stalnaker]

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

18789

Intuitionist logic looks best as natural deduction [Mares]

18790

Intuitionism as natural deduction has no rule for negation [Mares]

4. Formal Logic / E. Nonclassical Logics / 3. Many-Valued Logic

18787

Three-valued logic is useful for a theory of presupposition [Mares]

4. Formal Logic / F. Set Theory ST / 4. Axioms for Sets / b. Axiom of Extensionality I

16449

In modal set theory, sets only exist in a possible world if that world contains all of its members [Stalnaker]