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All the ideas for 'Necessary Existents', 'Review of Frege's 'Grundlagen'' and 'Wittgenstein's 'Tractatus Logico-Philosophicus''

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3 ideas

4. Formal Logic / A. Syllogistic Logic / 1. Aristotelian Logic

23505

Aristotelian logic cannot express 'Everyone loves someone' [White,RM]

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]