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'Perception', 'Remarks on axiomatised set theory' and 'Introduction to the Philosophy of Mathematics'
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5. Theory of Logic / J. Model Theory in Logic / 3. Löwenheim-Skolem Theorems
17878
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If a 1st-order proposition is satisfied, it is satisfied in a denumerably infinite domain [Skolem]
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Löwenheim proved his result for a first-order sentence, and Skolem generalised it [Colyvan]
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