Combining Texts

Ideas for 'Rationality', 'Contextualist Solutions to Scepticism' and 'A Tour through Mathematical Logic'

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4. Formal Logic / F. Set Theory ST / 4. Axioms for Sets / e. Axiom of the Empty Set IV

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Empty Set: ∃x∀y ¬(y∈x). The unique empty set exists [Wolf,RS]

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

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Comprehension Axiom: if a collection is clearly specified, it is a set [Wolf,RS]