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All the ideas for 'Necessary Existents', 'Review of Frege's 'Grundlagen'' and 'works'

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3 ideas

2. Reason / D. Definition / 1. Definitions

15927

Definition just needs negation, known variables, conjunction, disjunction, substitution and quantification [Weyl, by Lavine]

6. Mathematics / B. Foundations for Mathematics / 5. Definitions of Number / c. Fregean numbers

9992	The 'extension of a concept' in general may be quantitatively completely indeterminate [Cantor]

19. Language / D. Propositions / 3. Concrete Propositions

19216

Propositions (such as 'that dog is barking') only exist if their items exist [Williamson]