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'Function and Concept', 'Five Milestones of Empiricism' and 'Philosophy of Mathematics'
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5. Theory of Logic / A. Overview of Logic / 5. First-Order Logic
18108
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First-order logic is not decidable: there is no test of whether any formula is valid [Bostock]
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18109
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The completeness of first-order logic implies its compactness [Bostock]
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