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'Internalism Exposed', 'Frege Philosophy of Language (2nd ed)' and 'Freedom to Act'
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4. Formal Logic / F. Set Theory ST / 2. Mechanics of Set Theory / c. Basic theorems of ST
10537
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The ordered pairs <x,y> can be reduced to the class of sets of the form {{x},{x,y}} [Dummett]
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4. Formal Logic / F. Set Theory ST / 4. Axioms for Sets / j. Axiom of Choice IX
10542
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To associate a cardinal with each set, we need the Axiom of Choice to find a representative [Dummett]
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