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'fragments/reports', 'Identity and Existence in Logic' and 'Substitutional Classes and Relations'
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4. Formal Logic / E. Nonclassical Logics / 6. Free Logic
18767
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Free logics has terms that do not designate real things, and even empty domains [Anderson,CA]
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4. Formal Logic / F. Set Theory ST / 4. Axioms for Sets / p. Axiom of Reducibility
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Axiom of Reducibility: there is always a function of the lowest possible order in a given level [Russell, by Bostock]
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