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Ideas for 'Topics', 'Remarks on axiomatised set theory' and 'Title, Unity, Authenticity of the 'Categories''

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2 ideas

5. Theory of Logic / J. Model Theory in Logic / 3. Löwenheim-Skolem Theorems

17878

If a 1st-order proposition is satisfied, it is satisfied in a denumerably infinite domain [Skolem]

5. Theory of Logic / L. Paradox / 2. Aporiai

11261

Puzzles arise when reasoning seems equal on both sides [Aristotle]