Combining Philosophers

Ideas for Anaxarchus, Mark Colyvan and ystein Linnebo

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4 ideas

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

17925

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

17926

Rejecting double negation elimination undermines reductio proofs [Colyvan]

4. Formal Logic / F. Set Theory ST / 4. Axioms for Sets / n. Axiom of Comprehension

10779

A comprehension axiom is 'predicative' if the formula has no bound second-order variables [Linnebo]

4. Formal Logic / F. Set Theory ST / 5. Conceptions of Set / d. Naïve logical sets

23445

Naïve set theory says any formula defines a set, and coextensive sets are identical [Linnebo]