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Ideas for 'Gilles Deleuze', 'Propositions' and 'New Foundations for Mathematical Logic'

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3 ideas

4. Formal Logic / D. Modal Logic ML / 1. Modal Logic

19209

Simple Quantified Modal Logc doesn't work, because the Converse Barcan is a theorem [Merricks]

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

19208

The Converse Barcan implies 'everything exists necessarily' is a consequence of 'necessarily, everything exists' [Merricks]

4. Formal Logic / F. Set Theory ST / 4. Axioms for Sets / a. Axioms for sets

9879	NF has no models, but just blocks the comprehension axiom, to avoid contradictions [Quine, by Dummett]