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Ideas for 'fragments/reports', 'Identity and Existence in Logic' and 'Substitutional Classes and Relations'

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2 ideas

4. Formal Logic / E. Nonclassical Logics / 6. Free Logic

18767

Free logics has terms that do not designate real things, and even empty domains [Anderson,CA]

4. Formal Logic / F. Set Theory ST / 4. Axioms for Sets / p. Axiom of Reducibility

18130

Axiom of Reducibility: there is always a function of the lowest possible order in a given level [Russell, by Bostock]