Ideas from 'Remarks on axiomatised set theory' by Thoralf Skolem [1922], by Theme Structure
[found in 'From Frege to Gödel 1879-1931' (ed/tr Heijenoort,Jean van) [Harvard 1967,0-674-32449-8]].
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4. Formal Logic / F. Set Theory ST / 4. Axioms for Sets / a. Axioms for sets
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Axiomatising set theory makes it all relative
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5. Theory of Logic / J. Model Theory in Logic / 3. Löwenheim-Skolem Theorems
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If a 1st-order proposition is satisfied, it is satisfied in a denumerably infinite domain
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6. Mathematics / B. Foundations for Mathematics / 1. Foundations for Mathematics
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Integers and induction are clear as foundations, but set-theory axioms certainly aren't
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6. Mathematics / C. Sources of Mathematics / 1. Mathematical Platonism / b. Against mathematical platonism
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Mathematician want performable operations, not propositions about objects
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