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Ideas for 'Leibniz: Guide for the Perplexed', 'Believing the Axioms I' and 'First-Order Modal Logic'

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5. Theory of Logic / F. Referring in Logic / 3. Property (λ-) Abstraction

9725	'Predicate abstraction' abstracts predicates from formulae, giving scope for constants and functions [Fitting/Mendelsohn]